ShadowBass;1126080; said:The whitish stuff on his dorsal fin?
Could be anything.
At the worst fungus or something like that, but likely scarring, or just discoloration. Watch it and if it doesn't spread or start to look worse don't worry about it.
BigPleco;1126096; said:Looks like your O's got into a dispute. It'll heal up just fine in a week or so.
tknjk;1126379; said:what kind of salt, and how much do I put in? it's a 55 gallon?