Columnaris is really making its rounds right now! Almost every post in my fish groups both on Facebook and elsewhere are being dominated by the subject. Ive been dealing with it my my QT tanks for 2 months now and Ive tried quite a lot of meds and learned a lot. Before I knew what it was I treated my new, EXPENSIVE breeder guppies with the med trio, then 14 days of medicated general trio flakes, then Erythromycin and Furan 2, and now sulfaplex. It seems to have slowed down with the sulfaplex though Im still losing fish. At this point I dont expect anyone left to make it because of internal damage but at least now I know what to look for, how to identify it, and I have sulfaplex in my medicine cabinet to add to my QT treatment from the beginning. I didnt know about columnaris before but now my QT trio is going to be a quartet, especially with so many fish farms, stores, and breeders being affected right now.