Floating plants like water lettuce and water hyacinths provide shelter and hiding places for koi and goldfish and can protect them from predators like herons.

Floating plants like water lettuce and water hyacinths provide shelter and hiding places for koi and goldfish and can protect them from predators like herons.

Ich (Ichthyophthirius multifilis) is probably the most common parasite in ornamental fish. It is one of the few microscopic parasites that can be diagnosed without a microscope, because it has one life stage that produces salt grain sized ‘cysts’ that are easily visible with the naked eye.