Now how does this work I have had 3 goldfish and at least 30 other tropical fish in the one 55 gallon tank and I have had no casualties? Am I lucky or is this ok..... I have 3 rummy nose tetras, 6 neon tetras, 4 angelfish, 1 bumble bee goby, 1 killifish, 2 golden pencil fish, 1 zebra loach, 8...