My 55g is infested with either Bryopsis or GHA. Most of the natural predators ignore the stuff.. The only one that seems to be interested in the pencil urchin. I am usually not a fan of chemical treatments, but I have been doing some reading on the subject and decided to give it a try. I ordered a vial of Flux Rx. Put it into the tank on Oct 29. This product is basically Fluconazole. As you can see in the attached pictures, I manually cleaned most of the rocks with some pretty good success. Unfortunately, the remaining affected areas are not something that can be easily removed for cleaning. I will be posting updates here throught the process to document the treatment.