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All of a sudden all my fish have started to die. Cleaned the undergravel filter, changed the heater, regular water changes have not helped. introduced new fish a week ago, regular supplier of community tank stuff we hve used before - 6 black widows, 10 black neons and 6 platy - all dead, apart...

our tank has suddenly started to die - really need advice here. Been keeping fish for a while and tank was OK. Undergravel filter working, regular cleaning and water changes. Now all the fish keep dying. Only thing that seems to be living is our Plec, one Cory and eight black widows. Any ideas?