Water Test KitsUsing test kits to detect problematic water conditions is key to the sustainability of a healthy aquarium. For a fish-only tank, you should measure and monitor pH, alkalinity, ammonia, nitrite, and nitrate levels. In addition to these, you should also monitor the calcium, magnesium and strontium levels in a reef aquarium.
$11.99Hagen Living Sea Hydrometer with Thermometer—Large Accurate Easy to read Thermometer—C & F Learn More
Price From: $7.99Are you worried that the salinity level in your saltwater aquarium is not kept at a constant level? A fluctuating salinity level is bad news to the organisms living in your tank. Water evaporation which occurs in your aquarium eve... Learn More