UPDATE:
Hi! Unfortunately Roo isn’t doing too well.

His fins haven’t seemed to get any better, if anything they have gotten slightly worse (more noticeable on the top fin).
I tried taking out the blue plant, but it was to no avail. I also sanded down some rough edges on the main hut in my tank, but that also didn’t seem to help. So I’m stuck on that part!
He was doing alright (besides the fins) until Friday (the 14th). I can’t remember exactly what I saw but ever since then he has been acting strange. Usually when I came up to the tank he would come swim to the front, but now he doesn’t. I have also noticed he hasn’t been swimming as much. Don’t get me wrong, he still swims, but tends to float around in a few select spots everyday. The last day of two I noticed his breathing seems pretty heavy, but I just did a water change this morning, and it’s continued through today.
I have no clue what is wrong! My best four guesses are he is ‘sick’ with something, constipated, depressed, or possessed.
Here are some things that may be important:
• I replaced the Fluval carbon filter media three says before I started noticing a difference in behavior. It is too big for the spot, but I didn’t want to waste them so I stuffed one in there and managed to make it fir. There also weren’t any specific instructions on what to do.
• I can’t remember what day I sanded the hut, I think it was the same say I changed the filter media. I think some paint came off—is it possible that it have poisoned the water?? I rinsed it off well before I put it in (or so I thought) after I was done sanding.
• When cleaning his tank, I didn’t notice much poop. There may have been some, but I wasn’t sure if it was old or not poop at all because it was really hard when I observed (😳) it with a paper towel.
• The temperature fluctuates quite a bit. Whenever it gets too high (above 83 degrees) I float a bag of ice in the tank and that helps to lower it. But the summers can get hot and humid where I live so it’s hard to regulate all the time, and it usually doesn’t stay. Could it be a bad case of temperature shock?
• He is still readily eating when I give him food, and last time I checked (yesterday) the water quality seemed to be okay (ammonia wasn’t exactly 0 but I think pretty close)
• My most recent water change was 8/18 (today).
• I started using Seachem stress guard two days ago to see if it helped anything.
I am completely lost! (And very worried 😕 poor little guy doesn’t seem to be in good shape whatsoever). One day he was doing fine and swimming up and greeting me, but the next day he seems to stare off into space all day. If anyone has any guesses at all, let me know. (P.S. How are you guys so good at this stuff?! It’s so much harder than it seems!) Thank you so much in advance. I really appreciate everyone’s patience, support, suggestions
