Hmmm I didn't notice those before, maybe I'll start treating him with some maracyn TC I have left over as I heard it was good for bacterial infections in the gills. Anyone know what that fluid like build up could be in the first picture? I've been looking everywhere but it seems like it could be so many different things, if I can narrow it down and treat the proper sickness obviously that would be a lot better than treating the wrong one and perhaps make him sicker. I'll go back upstairs and see if I can't snap some pics zoomed in on the gill region. I wonder if it was a bacterial infection or parastite from the store though because 2 of my cories died unexpectdly well after the cycle and they had all their color, no odd behavior, anything, I just went to bed and woke up and they were dead one night after the other. If it lasts much longer I may just euthanize him because he's already breathing really hard and I don't want to make the poor guy suffer any longer than he has to.
Update:
I ended up losing the little guy, he got stuck onto the filter again and it actually pulled off some of his skin so I euthanized him because he looked to be in a lot of pain. I have no idea what to do now, it seems anything that goes into this tank kicks off. Water quality is fine, only other thing I could think of is some sort of bacteria or parasite in the water, but my 2 danios that are left look fine, although one of them seems to be losing a little color on his stripes. I don't know what to do, it really disheartens me that I've sent all these fish to their death. My tank has now aquired the name the tank of death from my family :-/
What can I do to neutralize the tank of any parasites/bad bacteria that remain in there? I was thinking of taking my remaining two danios out and cranking up the temp and throwing a bunch of aquarium salt in there and maintaining that for a few days then do like a 90% water change. I want to avoid having to redo everything because I don't want to have to re-cycle the tank. :/