the tank is just a 20 gallon with an in the tank filter, and bubble wand in the back. i had posted in another thread was told water change ( i had put salt in about 1 1/2 tbs, was told not to do that) so i just did that, before change ammonia 0, nitrite 0 ph 6.4 nitrates 10ppm, fish still at the top the same as before. the tank is about 8 months old, have had fish in it for 2 months, before i could not seem to keep the nitrates down no matter what, then found "nitrazorb"
the fish seem to have done well till yesterday morning when i got up to find 3 dead. water change done then also 50%, again this am 2 were dead, most of fry also, only have 5 adults and 2 fry left