What is Ammonia Level? What is Nitrite Level? What is Nitrate level? What is Ph Level, Tank (If possible, KH, GH)? What is Ph Level, Tap (If possible, KH, GH)? What is the brand of test-kit used(strips or drops)? What is your water temperature? ~75 What is the size of the tank (how many gals.) and how long has it been set up? Just upgraded to a 75 gallon tank from a 55 What is the name and size of the filter(s)? 2 filters rated 40-60 gal I believe they r top fin Is there any substrate in the tank? If so how deep? and what kind (sand, gravel)? I have gravel/ pebbles just smoother rocked that's a little bigger then normal fish gravel from the pet store How often do you change the water and how much? Once every 2 weeks 20-30% How many fish in the tank and their size? I have 10 fish in all 6 are smaller then 3 inches the other 4 are about 5-8inches long Do you use water conditioner(if so, what kind)? No What do you feed your fish and how often? Twice a day Is there any new fish/plant added to the tank? if so how long is the quarantine period? Added 3 new fish a few weeks ago Is there any medications added to the tank? Just put in all in one medicine takes care of bacterial and fungus and everything else (suposally) Describe the problems you are seeing: example grains of salt on body, bloddy streaks, frayed fins, fungus, staying at bottom, not eating, etc? I just received a three large gold fish about 6-8 inches long and very fat they came from a lady that didn't want them anymore and I think they are over 3 years old. Anyway in the set of fancy goldfish I got a black moor with was the largest of the 3 (they used to be in a 30 gal tank before I got them). They all seemed to be doing great but a few weeks in the black moors tail looked shredded I will post pictures of before and after so far no other fish have shredded tails.