so my betta has been in his tank (6gal) for a few weeks now and everything was fine until I noticed something strange happened to 1 of his ventral fins.
Taking a picture was a complete failure, so I tried to draw it.
On the left, what the fin looks like, on the right, what it used to look like.
I don't know what to do.... I read something about trimming the fin so it regrows but being a novice the idea of trimming is pretty scary.. I would rather do something else
I tested the water... everything seemed fine =/