[quadratic]

Hey guys.... i just noticed my piraya has body slime all over him, and he is in rough shape.. my friend mentioned getting this medication called Furon 2, but when i went to my lfs, the guy said not to use it and just do 25% water changes till it gets better.. he said piranhas are sensitive to medication and are hard to treat... What should i do.. any help would be much appreciated..

P.S. sorry i have no pictures.. no digi cam