I have a 38 gall eclipse with teh standard filtration of that brand. It was a successful aquarium until our recent move, which none survived due to a huge error on my part.
I filled the tank using the same gravel and bought 5 platties. Within days, 2 had died. Another died about a week later. My water was tested using liquid testing 3 times and has been found to have levels of 0. The fish store man thought perhaps they had spiked and killed off most the fish and then gone back down. He thought it'd be fine now. So I bought 2 angels. w/in a few days, one died. I exchanged him for another, who was dead by the next afternoon.
I don't want to kill off anymore until I figure out what is going on - but it's a decent size tank - 2 tiny little angels shouldn't have been able to create a huge toxin problem...
I have lost more fish in the past month than I think I've ever lost total (excluding the unfortunate massacre when we moved) Help? I feel like a fish murderer.