My Corys keep dying and I have no idea why. I started with 9 (3 from my LFS and 6 from a reputable online vendor). Within days, most of them died. I drip-acclimated them. My tank is fully cycled with 0 ammonia, 0 nitrite, nitrates between 10 - 30, PH consistently at 7.8, temp always at 78.3 at the lowest and 78.5 at the highest. It's a 55 gallon tank with 6 angelfish, 5 SAE, 2 Mollies, and 2 Plecos. The angels never bothered the corys. I have no idea what's going on. I had Otos and they didn't make it either. I love corys but I until I figure out why they keep dying, I'll have to stare longingly at your images and videos. Also, any advice would be very much appreciated!