I've dealt with a lot of fin rot in several different rescue betas... My 2 most recent cases are 2 males that share a divided, heated, filtered 10gal. They are active, great eaters, and I have been fighting fin rot with them for about 2 months on and off- water changes, AQ salt, anti-bacterials, antifungals... gone thru everything at some point in time.
Sometimes I get ahead and then something happens (heater crash, whatever) and I lose ground. But thru all this they have remained extremely active. I've treated them together this entire time b/c they show the same symptoms.
However, 3 days ago I notice the crowtail (Boo) looks like his dorsal fin has been painted white with white-out. It's not cottony. And the other one does not have it. There are no spots on his body. But it has spread over his entire dorsal fin now. No change in behavior.
What is this? It does not look fungal. I don't know his exact age but I've only had him 6 months so I don't think he's very old. I've never seen one marble like that either.
Right now I am treating for possible Ich, as that's the only thing I can think of that I have not covered.
Any thoughts please?