Hello all! I have recently bought a betta (and extensively researched them after purchasing) and put him in a suitable tank (6.6 gallon.) I noticed a small hole in his tail after acclimating him into the new tank, and I believe it is from constantly flaring at his reflection in the new tank (he didn't do that in the one gallon I originally bought him in). The flaring didn't stop after multiple attempts to reduce the reflection on the inside, and his tail eventually tore in two. This was yesterday, and this morning I woke up to find the top of his tail completely frayed. It looks brutal, the poor guy.
I just bought this tank, cycled it, I have no plastic decorations: only smooth driftwood, substrate, and live plants. There are no signs of fin rot or infection otherwise. Water parameters are good, and he has no tank mates other than a single ghost shrimp. Also, the filter has a sponge over the intake, so no way is that the cause.
I really just need validation, as I am sure he has been flaring entirely too much for his own good. Can frayed fins be caused by excessive flaring? I've tried everything short of wrapping his entire aquarium in backgrounds to get him to stop.