<a href=showthread.php?s=&postid=13458721#post13458721 target=_blank>Originally posted</a> by tmz
Hi Scott,Good to talk to you again.BTW check out my thread in the URS local forum on my system. entitled My 600gal puddle.
It's hard to tell from the picture . It doesn't look like velvet (amyloodinium)at all . If it was crytocaryon irritans it would not have been there for ten days.
My guesses are some form of fungus or lymphocystus. The later is a viral infection with no known treatment that is rarely lethal and usually heals with good nutrition and water quality. Fungus or other skin based infestations should respond well to a formalin bath. I use a product called Fomalin 3 and admisnister a 45 minute bath in a bucket of tank water with a small power head or airstone for aeration during the dip.There are alternative anti fungal medications out there but I have used the formalin bath without ill effect and with good results. Following the manufacturer's dosing recommendations is important. Not all formalin products are of the same strength, some are 37% formaldahyde and some like formalin 3 are only 3%.At the proper strength it will not harm fish in my experience.