Mardel Laboratories Maracyn Plus Bio Antibiotic Fresh Water or Salt Water is  for mouth fungus, popeye, dropsy, and ulcers. The microscopic biospheres attach directly to the fish delivering the medication where it is needed. Prevents re-infection during treatment.   Symptoms:  fin & tail Rot-fins are torn or frayed. Popeye- eyes may be cloudy, hazy o protruding Dropsy- fish hides, does not eat, has a swollen body and appears sluggish. Ulcers- sores, bleeding, or red streaks on body. Mouth & body "fungus"- grayish white stringy material covering most of the body and mouth, white or gray patches.