Background:

I have a 10g with 6 Albino Cories (I'd like to upgrade the tank but don't have the space for it right now unfortunately). Also have some Assassin Snails and Zebra Nerite Snails (going to be setting up a snail tank soon, because my Assassin Snails bred like crazy). No pest snails are left because of the Assassins. There's a fair amount of plants floating around. pH is ~7.4, Ammonia and Nitrite are 0ppm, and Nitrate is 10ppm. When I first had 3 of the fish, there was some Ammonia/Nitrite poisoning that happened for a while before I could get it under control. There's a cyanobacteria issue but I manually remove it to keep it in check. Finally, I've been watching the fish behavior almost daily and they're eating, scavenging, swimming, doing normal cory things.

I would really appreciate some advice on the following problems, even just some of them if you can't answer all.

Problems:

1) One of the cories (I'll call him "Bingo"), when you look at him head on, it looks like his sides are bulging way out. Not in a pregnant way but in a pointier way? It's kind of prominent (don't know how I didn't notice before), and it doesn't look natural -- I am concerned.

2) On Bingo, I saw a dark spot on two of his bottom fins as well as at the tip of his tail fin. I'm not sure if they've came off since then or not. I found another dark spot on his underside.

3) Also on Bingo, when I was looking really close, I saw some whitish (not bright white) spots on his tail, except they seemed kind of radially symmetric so I can't tell if it's Ich or not. I also saw a white spot near his tail that was brighter but that could've just been scales, I can't tell.

4) I noticed Bingo was breathing quickly today after he ate, and looked a little pinkish (tbf, some of them look a little pinkish). Also, a lot of the fish have red gills, I don't know if that's permanent or if something is currently going on to cause that.

5) Some of the fish "flash" periodically. I talked to the vet about it and she said that given they're eating and otherwise acting normal, I shouldn't be too worried (before I knew about the spots and bulging, anyway).

6) I don't know how to describe this besides .... some of my fish "play dead." This has already happened a few times. Today I put food in and normally they all lose it, but one fish stayed completely motionless in the dark of under the log. I nudged him and eventually he started moving and then got all excited because food. Sometimes it takes a few pokes to get the fish "playing dead" to move, and then they act perfectly normal...? They are usually upright in a normal position when they do this, but once, a fish laid sideways, motionless, and after a few pokes got up and moving...? I don't know why they do this.

7) I also found a fish doing the "playing dead" thing except his head was buried in the sand. I honestly don't know how he could've breathed like that... I think this has only happened that way once. And after some pokes he was fine...?

8) One of the fish that "played dead," after I poked him, he started swimming but seemed to have a major kink in his side. Like his side was at a maybe 120 degree angle from his head. It didn't look good. But this was maybe two weeks ago.

9) One of the fish that I had since the beginning (since the Ammonia/Nitrite issues), his eyes look all white and I'm not even sure if they're his eyes or just the sockets... I feel bad either way and want to see if I can help him. It's been this way since Summer 2023 and I tried 1 medicine but it did nothing for him. (Ironically, this guy is one of the best eaters and one of the biggest.)

10) One of my fish is motionless again but baby Assassin snails are climbing all over him.

Thanks in advance for any advice. Debating whether to talk to the vet, yet again.