Something is wrong with my tank. It has been running for a couple of years. About a month ago suddenly all the fishes in the tank died. All I had in there are neons and tetras. So i keep trying to add new fishes in there but they all died within introduction. I have a 56 gallon tank running on two Aquaclear 70. Reading on the water test is ammonia 0 nitrate 20. Any ideas guys as to what is going on?
to MFK!