Originally Posted by guineawhop
you have a fungus in your tank. go to the store and get PIMAFIX you can put this directly into your main tank because it is safe for inverts and live rock as well. it is an organic medication that will take care of your problem without disturbing your ecosystem. pimafix is made by the same company as melafix
Wait a minute here. There is no way from the description above that you can make this assessment.
Houndhome, can you give more details? How long has the tank been set up, what are it's parameters...what are the other tankmates...etc. Can you look at some pics online to determine exactly what the fish might have?{type in cryptocaryon irritans{ich}, and Oödinium pilularis{velvet disease}..these are the two most common parasites.