Our fish have all died, except our two rosy barbs, it initially started out as white spot - ich, both black moors and platties got it, we checked the water - that was ok, and was told to use protozin- 3 mls for our 48 litre tank,every day for two days, all four fish died two days ago, except the rosy barbs. Funnily enough the moors produced a white film over their bodies before they died, and now the two surviving rosy barbs have it plus the white film. What the hells going on here. We are both obviously upset.