So I have a rainbow shark in my 60g tank, along with a Jack Dempsey and Red Texas. As of now they are all still pretty small and around the same size and there’s not very much aggression in the tank. My concern is that a few weeks ago I notice a slice in my rainbows sharks bottom fin and I was thinking it’s either he ripped it or another fish cut it. But after a week or so it just grew back in. Now today I notice the same thing on his top fin and I’m wondering if it’s maybe a part of the way this fish grows. I’m not sure what to think or do about it but let me know what you guys think, thanks!