My goldfish Gil has a weird elongated white lump along the front of his dorsal fin. There appears to be super little white pieces of fin hanging off of it. My levels are; 60 ppm nitrate, 7.9 ph, 0.25 ppm of ammonia, and 0 ppm of nitrite. I have four fancy goldfish, each about 2.5 inches long, in a 36 gallon tank. Whats wrong with him?