One of my girls in my sorority (Ascari) is missing 2/3 of her dorsal fin as of this morning. It is swollen at the base and bleeding. I've had some fin nips but I am fairly certain that the other girls did NOT do this to her. When I was in my room earlier and the lights in the tanks were still off, I heard what sounded like one of the girls jumping out of the water and smacking the hood of the tank pretty good.
Do you think this could be from her jumping and hitting the lid? Daihatsu is usually my suicidal fish, not Ascari, lol. I don't know if this could even be from the other girls since it's pretty bad and Ascari is usually the one chasing the other girls around.
My main question is, do I wait for it to heal or do I need to treat is ASAP
since there is an injury on her body and not just her fins?
I do have vitachem in the tank and I added a few more drops after I noticed this. There has been a few nips and tears but no rot because the water parameters are good.
Edit: I know the picture sucks but it's functional. Even with her fin looking like that, she's super active and won't stop moving around! She's not acting strangely.