ok...After two failed attempts to keep fish in the past, and getting frustrated because the fish kept dying, I stumbled on this site and purchased a new tank and did the fishless cycle. Two months later, the tank was cycled. I added 3 black neon tetras and one cory cat (followed the acclimation guide on liveaquaria.com). 5 hours later, one of the neon's died and less than 48 hours later another neon died. This is really starting to pi$$ me off. Guess I'll start a rock collection.