Originally Posted by gregwegmann
A grey color has begun to spread up my Betta's back fin. It is a blue betta so it may be that unknown disease covered by a sticky on this forum. I know this isn't normal. I can't get any aquarium salt. Should I make a new batch of water for him immediately? his is looking kind of murky. What else can I do?
Can you post a picture? It would be really helpful.
I may have had a fish with the 'mystery disease' (which was recently identified as a type of Mycobacteria.) His fins turned gray and were clamped. The progression was rapid.... His water was NOT murky, however.
When was your last water change? (I know he's new, but I don't know exactly when you got him.)
Also, what's in the tank with him? Could there be a decoration or something that's affecting the water quality?
Personally, I'd do a 100% water change. There's never anything wrong with clean, warm water.
Acclimate him VERY slowly afterwards by floating his cup in the new water until the temp inside and outside is the same.... Then add a SMALL amount of new tank water to his cup.... Wait awhile, then remove a small amount of water from the cup, and add a small amount water from the tank... etc. Go slow with this, as he's already stressed.... Eventually, when the water in his cup is mostly new water (and the murky stuff is gone), you can release him back into the tank.