I know that you guys said not to bother with test kits, but i just tested my tap with this new one, and it came out as normal. I've tested the tank 3 times, and it keeps showing up as 8PPM(which has to be impossible) Over the past week, i lost a ram to pop-eye and another peppered cory was dead this morning.  no other fish show any sign of disease. There is no algae in the tank other than a little bit of green on one piece of drift wood. The only plants still in the tank are the two crypts, and they are both looking better than ever with no dead leaves.I have not added any new fish, plants, substrate or any chemicalsNobody is cleaning near the tankI've kept up on my water changesI have not taken any media out of the filters. I only feed 5 days a week, and they gobble it up in just a few minutes.What the hell could possibly be going on at this point? Why am I still losing fish? It's been several weeks since the total clean out and massive water change.edit: Also took fanatic's advice and went with a black background for the tank. I like the way it looks, and I'm sure it will look even better once the tank is filled up a big with plants.2nd edit: is it possible that my food is bad? the flake that i bought back in June has a sticker on it that says 12/05. However, the corys, who are the ones dying for the most part, don't really eat the flake. I may just go and buy all new food just to be safe.