I don't know if anyone can help me, but I need to vent, anyway.
So. I finally found an orange betta (my favorite color -- I have been looking for one for a while). His name is Julius. He was in a 1-gallon mini-bow all by himself with gravel and a silk plant. He was in there for a week or so with no fin issues whatsoever, even with a pretty good current going on in there (which he didn't seem to mind). I did my water changes, etc.
Last night I decided to switch him to my 3-gallon Eclipse that houses my ADF (and previously some ghost shrimp until the frog ate them...). The betta, Kroenen, that was in that tank got moved to isolation because his fins were getting ripped and he started tailbiting and he just didn't seem happy anymore. He's now in the 1-gallon and seems to be adjusting fine.
I cleaned out the Eclipse last night, switched all the plants to silk (thinking that plastic plants could very well have been part of my problem), put Julius in the tank and everything seemed fine -- I watched him with Johann (my ADF) and there weren't any problems.
Until this morning... I noticed some very slight tearing of Julius' caudal fin. I put him in a floating isolation tank right away with a little extra salt, but I am so frustrated! The water's clean. There are no sharp edges. The current is actually less strong than what was in the 1-gallon.
Could it simply be that the ADF has to go? (Into another tank, of course -- I am not going to throw him out the back door. I actually really enjoy the little guy.