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Disease for beginners...
There are 4 sorts of ailments that befall fishes.

1. germs. Bacteria. These are single-cell organisms about the size of a single blood cell that get into a fish and spread very fast by dividing. They are treatable with ANTIBIOTICS. There IS a slight catch in this: bacteria come in two varieties, one called 'gram positive' and one called 'gram negative', for reasons of how they show up when stained fro a microscope slide. When you treat, you have to...