Dos and don’ts for aquarists fighting mycobacteriosis Mycobacteriosis is one of those diseases that long-term fishkeepers will likely encounter in their fish at some point during their time in the hobby. Keeping highly susceptible species such as rainbowfish, syngnathids, and bettas makes dealing with mycobacteriosis inevitable, but it’s safe to assume that every fish you…

A fish veterinarian explains what “Diamond Eye” is When Jen and I went down our fancy betta rabbit hole in the summer of 2021, we ran across many instances of fishkeepers describing a condition informally known as “diamond eye” in bettas. We also started to see the condition develop in some of the new bettas…

A fish veterinarian explains what “Hole-in-the-Head” Disease is (and isn’t) The first Oscar (Astronotus ocellatus), “Dino,” that I ever kept developed “Hole-in-the-Head” (“HITH”) Disease (also commonly referred to as “Head and Lateral Line Erosion” (“HLLE”) by hobbyists). Pitted areas that were paler than the rest of the skin started around her nares, spread to cover…