Sunkist had BEAUTIFUL new fin growth going on, his tail was a whole half-inch longer. Then he goes and rips it :C On what I'm not sure.
Since I put him in the 1.5, he's been fine, but the past 2 days he decided to make the filter his "cave". No, we're not gonna do that, it may be air-pump powered, but we ain't doing that. So I put a old coffee mug in. Things were fine after that, I also lowered the water since I noticed it was to high with the filter.
I guess he still wanted into the filter and tried jumping, and might've ripped his tail that way. Its not very bad, just the new growth is tattered now.
I'm mad at him now, and he seems to know it.
Something new to add, while typing this thread, I looked over at his tank, and I caught him swimming against the filter current, preparing to jump into the filter. I caught you red-handed! Er...red-finned! >:D That filter is coming OUT.
I now get the joy of treating two fish for fin damage :/
Cheddar is looking better, the medicine is working. I use Melafix Fish First Aid D: I probably should be using something else, but it works. Cheddar's giant rip in his tail is slowly growing back, and he's not changed his behavior or coloring.
If you recommend a different med over Melafix, let me know. I've got spare money to buy some online.
Update/Edit: I've decided not to medicate him right away. :B I'll watch him for a few days. Doing a 100% water change right now instead.