Comments: There cheap but not bad for the money. And their mounts work better than most any with suction cups.

Comments: It moves water around with out any problems. I always re-adjust the positions and angles, and its very easy. Suction cups hold on well without falling off or problems. So far great product

Comments: It is good product, but too much flow for 20 gallon tank or under. combine with other filtration (200gph) , it gives high flow, will blow your sand one side to another.

Comments: Strengths- small, works on a timer
<br />Weaknesses- current could be a little more diffuse

Comments: great!!!

Comments: The service provided by Customer Service was exceptional; however, if you look for a powerhead for a reef tank with the intention to move your water stay away from this weak powerhead. This head doesn't even push a 30g tank, my return feeds push more and stronger currents then this powerhead. I will be using this powerhead for my watermixing or something else.... I recomment a EcoTech Marine MP10 from Vortech

Comments: Nice pump. Good flow, quite operation and easy setup. Will purchase again for future builds.

Comments: I'm very pleased with the equipment up until the arrival of these heads I was using the 750 model but because of the size of my tank which is a 40 gallon saltwater tank I had too much motion going on in the tank. These 2, 240 models fit the build perfectly.
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Comments: Really like this powerhead as it is the only one offered in a low GPH. 240GPH is perfect for my 36" long tank. I tried the lowest GPH that aqueon makes which is 500GPH and it made my tank into a toilet bowl.

Comments: Using these in all my tanks. Have the Ecotech wave pumps in my 125 gal but still have some dead spots in back corners; these pumps take care of the problem. Also great for added flow to 14 & 29 gal biocubes.

Comments: great water flow but dont like the pivot design. all in all it is awesome!

Comments: I use these in many applications: I have then in my refugiums for increase circulation, I use them in 5 gallon buckets to mix salt, and I use them in my nanos to increase flow. Overall I use a dozen or more of these without issue.

Comments: This is a great little power head. It's small and fits into the corner just right with just the right amount of flow. I just wish it would turn a 90 off the back glass, then it would be the perfect power head!

Comments: This would be great for a small tank! I made the mistake and purchasing two of these powerheads for my 75 gallon tank and there way to small! What a waist of money! The water flow from these powerheads is not very strong at all! Could not hardly tell they were on when they are running!

Comments: I've been using these powerheads for years and you can't beat the performance for the price. one of my evolution 750 front cover cracked and with a simple email to Hydor, they sent me a replacement cover for free. Great customer service.

Comments: Extremely quiet with great water flow. The magnet attachment is the best part about the item. Great product!

Comments: This pump does what it's suppose to and well built. Decent price and have purchased 3 of these. Very quiet and the magnetic back really helps the ease of use.

Comments: This product live up to the advertisement. I use one in my 14 gallon biocube and it gives good flow without overpowering the tank.

Comments: I like the small size and they put out good flow. I have four in a 40 breeder on a wave maker and they work great, plenty of flow for a mixed reef. they do make a bit of noise on start-up but it is tolerable. If your looking for a silent start up these are not the pump. Once running they are completly silent. Note: I had the old style nano and it did not work on a wavemaker. The new ones are doing ok so far.

Comments: Pump does what it states in a small tank. Great water flow with minimal noise during start up with a Red Sea wavemaster pro and very small and compact. Would recommend this to anyone who needs good water flow in a small tank.

Comments: I have a 29 gallon reef and so far this pump works great, ive only owned it for about a week an a half now. But everything is good so far.

Comments: I bought 2 of the 425gph pumps to improve circulation in a 50g reef. They are smaller than I expected and easy to hide,but I did not get the flow that I was hoping for. In a 50g tank these pumps will work great for dead spots,but not for primary circilation. I would say that they would be perfect for a 40g or less. The magnetic suction mounts keep these things put. With all that being said,I did place 1 of the pumps in a 10g fuge and it is almost to much flow. Nice compact circulation pump for 40g or less IMO.

Comments: This item works great for nano tanks. I was happy with the increased water circulation. The magnet mount works great.

Comments: I bought two of these for my new 20 gal saltwater reef tank. I took the time to read reviews about these so I was careful when I attached the pumps to the magnet/suction cup fitting, I can see where you could easily break the very small plastic ball/swivel, I took the advise I read and put a small dab of dish soap on the swivel first and carefully worked it into the fitting - no problem whatsoever with that approach (I made sure to wash them off of course before putting in the tank). Installation in tank was really easy, the magnets really help and hold these pumps securely. There is a limited range of direction, not bad though - I have one on one end of the tank pointed diagonally upward and the other on opposite side going diagonally downward. I think these provide the perfect amount of flow for this size tank, and they are silent in operation. As long as they last a good while I will be a happy customer - time will tell, it's only been 2 weeks but other reviews seem say these are reliable pumps.

Comments: I bought two of these for my 20 Gallon High Nano aquarium. They are absolutely perfect. No problem with installation and the magnet/suction cup attachment is genius! The move water perfectly and I don't have to worry about the suction cup losing suction because the magnet and suction cup on the other side will keep it in place.

Comments: I love this pump. I bouught 2 large ones for my 125 gal reef and have started haveing a problem with it reversing flow. Instead of pushing the water out, it sucks it in! At first if I unplugged and plugged it in repeatedly it would reverse and work correctly. Oe it would work fine at the sink, but as soon as I move it to the tank, it would reversd. Frustrating. Today I just couldn't get it to reverse. Had to put in my old rio and order a new one. Want to know why it happened and what I can do to keep it from happening to the new one and the one I still have in the tank. But it is a great pump.

Comments: Nice, quiet, and small, but I wish I would get a bigger one, still need to get more flow.

Comments: Seems to be a good little pump for my 11 gal SW tank, appears to be decent flow. Nice and small in size which was important for me. Not a lot of space taken from it. Adjusting the directional flow could be a lot better. But it is good. I would buy another one. Might be to small flow wise for anything larger than 15 gallons.

Comments: Love these powerheads. This is the second Koralia I've bought and can say that for the price, you can't beat these. I've seen an experiment that tested the actual output vs. advertised output and the Koralias came out at advertised or above. I love the design too. They're so sleek and look awesome, without sacrificing performance. Would recommend these to ANYONE with a tank less than 100 gal. Love how they come in extremely high to extremely low gph. The 250 was PERFECT for my 6.5 gal Fluval.

Comments: Excellent product very quiet. I would recommend the filter to anyone who wants an effective power head.

Comments: I did quite a bit of research on powerheads before I purchased and these are great. I have a nano tank and by adding these to it had done wonders for my tank. They work great. Highly recommended.

Comments: Very nice. It is small but powerful and very quiet. Gets the job done. Highly recommended!

Comments: Provides a strong but gentle current as to not trap animals such as my Sea Hare or other delicate animals.
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<br /> Other Powerheads can injure animals if they get neat the intake of Powerful Pumps.

Comments: Bought this powerhead for my 6 gallon Nanocube. The size is prefect, when attached via magnet through the back wall, and the flow is just right.

Comments: I bought this lil pump for my biocube 14, adds just the right amount of flow. The magnetic suction cup base helps with micro adjusting without disturbing the tank, you can move the magnet on the outside, allowing you to move the inside.

Comments: I purchased this pump to add some extra flow to my JBJ 6gal nano cube and I got exactly what I wanted. I have it positioned so that it directs the flow around the tank and there are almost no dead spots now. Wish I had gotten this sooner. Very compact for the added flow.

Comments: I have two of these pumps in my Elos Mini. Just keep them clean and they work great. Very quiet, don't even know they're on.

Comments: Works perfect in my 20 gallon fish only tank

Comments: I have several of these and they are a great powerhead for the price. Low power usage and they last a long time.

Comments: More compact than usual powerhead. Seems a bit fragile at the ball joint. Will it strip out at the socket after more usage? Will the mounting stay where you put it? Guess I'll know after a few months.

Comments: Great circulating pump, flows well, positions easily in the tank. Well worth the money

Comments: I like the large volume of water it displaces with the lower velocity. the only dissapointment is the ability to have it blow in a a fixed position. the ball and socket joint does not hold position other than straight ahead. overall a great powerhead for the price

Comments: great little ph moves alot of water but the little plastic part connectiong the magnet support to the ph is very weak and broke on mine before i even got it in water... ended up useing coral epoxy to attach it the the magnet. i was amazed at the size.... very small

Comments: Added one of these to my 24 g nano. Love it. Works great with my wavemaker. Make sure its low in the water to not get the little whirlpool around the head which can cause air bubbles.

Comments: Bought two of them for my 15g saltwater. They stick nicely to the side of the tank and don't make any noise.

Comments: Very good product, the Nano version has very little flow. I should have bought a bigger one!

Comments: I purchased the 425 gph Koralia Nano to replace a Koralia 1. The K1 is no longer available so I got the Nano. The Nano is much smaller than the K1 and puts out more flow! I especially like the fact that the Nano has a small footprint; works great; and is less obtrusive in my tank.

Comments: I love these things! I wanted a little more water movement in my freshwater tanks and these were perfect. It was easy to put together( a big deal for me) and runs quietly.

Comments: This little pump works great in my 55 gallon saltwater reef/fish tank. I use 2 in opposite corners facing ea other. The water movement is just right and does not blow the coral away. I recommend this product for novice or veteran hobbyist. This is a must have pump.

Comments: Great for my nano. Nice flow, nice and spread out even in a small (12gal) nano. A+

Comments: There was an imediate good response to the power head. The coral just love it.

Comments: This pump is great for smaller tanks. I have 2 on my 24g tank and supplys it with great flow. Bur be careful wen placing the magnet on.

Comments: I added this new generation of pump to my 12 gallon Aquapod.
<br />My current nano was the older breed and this one moves more and is smaller. I have both pumps going on each side of the tank and the water movement is great!

Comments: I bought this powerhead to replace my original koralia nano (which I modified for more flow). I am using this powerhead in a nanocube 12 gallon and it works great if the powerhead is pointed at the surface. pointing it at the surface creates a nice dispersed flow around the tank. It would be too much flow to point at the sand or directly at corals.

Comments: I bought this circulation pump to replace my old Koralia 1 that I had in my Nano Cube. The smaller size of the nano is perfect for smaller nano tanks. My only complaint is that you have to attach the suction cup to the pump when you take it out of the box. There is a red plastic ball and stem that you have to push into a small hole on the suction cup. This plastic ball can easily bend and break if you are not careful. Mine broke off right away with little force. I used glue to re-attach the ball to the pump. I recommend that you put a tiny drop of soap or type of lube on the ball before installing the suction cup.

Comments: I use two of these for my 36 gallon reef and they work great.

Comments: I have 2 of these and 2 of the smaller nano in my 60 gal reef tank on a Red Sea Wavemaker Pro and they work great. The flow is very good but gentle.

Comments: Great water flow and exceptional construction. Works great in my 39G Nano reef. Used to create flow in back of rock work. Small footprint. Very happy with purchase.

Comments: Great little compact PH. I couldn't be happier with it.

Comments: Very very small with decent amount of flow.

Comments: I'm using this pump with my ReefKeeper Light in wavemaker mode. So far I'm very happy with its performance.

Comments: I already have a bigger Koralia Powerhead in my 75 AGA, but wanted something to move the water a little more in my 56 Marineland. So I gave this little guy a try. I wanted something small enough so I could easily conceal behind the rock and this did the trick. I would have liked a little more flow and may purchase a second for the opposite side of the tank. Overall I am satisfied with this Powerhead.

Comments: Put the 425gph model in my 29g BioCube and its not only discrete but moves a good bit of water i dont think i will be needing to add another powerhead to that tank

Comments: For the price it is hard to beat. I have one set up in my 28 gallon nano and it is a great addition to the dual wave makers. I put oscillating heads on too and tank shimmers like the ocean. Everyone loves it. Oh yeah easy to clean too.