Red Marks on Green Chromis

[Frogger]

Originally Posted by LifeIsGreat

I've heard that uronema stays in the tank without a host fish.

Uronema is a “free living” parasite which does not require a fish host. So, going fallow will not eradicate it. Most fish seem protected from it via their natural immune system. There is a possibility that Metronidazole may work. At certain concentrations it is apparently reef safe.

Likely the only way to manage the pest now is to have healthy fish, low stress, and high biological diversity. Avoid Chromis. Unfortunately adding fungicides or antibiotics (metro) to your tank will not help with the diversity.