size: 150 litres
temp: 26 c
inhabitants: 4 marble mollys, 4 baloon mollys ( now 3 after todays death ) , 6 neons , 4 guppys, 1 white molly , 2 silver sharks , 1 parrot fish
chemicals used : 'bacterlife' weekly cleaning treatment oxadised nitrates etc
problem:
this morning i found a dead...