Yesterday I noticed one of my peppered cories didn't look too hot. No noticeable infirmity, but he wasn't swimming, and I wasn't entirely sure he was actually still alive until I went to fish him out and he darted away. Figured maybe he was sleeping or something so I didn't think too much of it. I checked my water parameters just to be safe, and everything was fine: ammonia, nitrate & nitrite all undetectable, pH 8 (which is normal for my tank). This evening I happened to look in my tank and saw that one of my cories had red patches down both sides and he was on his side sort of twitching. Not good obviously. Went to get my phone to snap a picture and when I came back he'd moved, and was twitching on top of my other cory, who I'm 99.9% sure is dead.
I can't net a fish out without draining some water (my arm will displace too much water and it overflows...found that out the hard way!) so I pulled out my siphon and started sucking up some java moss debris I'd been meaning to clean up and managed to suck up both sick/dead cories, so I moved them to my quarantine tank. Sick guy is still twitching, and the other guy doesn't appear to have moved so I'll flush him momentarily, but I was hoping someone could clue me into what's wrong with my other guy.
Of course this would happen the night before I go out of town for a few days, and after every store around here that I might get meds from has closed for the night.
Some background info on the tank: 15g column, planted.
Inhabitants: 8 neon tetras, 1 serpae tetra, 2 nerite snails, (now) 1 cory and a couple dozen red cherry shrimp. I know my tank is too small for the cories, but I have them and I don't have anywhere to rehome them so it is what it is. I have tetracycline and pimafix on hand, along with a variety of old ick meds, but that's about it. Anything that I can do before I leave tomorrow? I might be able to get something before I leave, but I'll have to rely on family to do the dosing for the weekend...