I’m not putting any more fish in until I can figure this one out. I am also going to purchase a QT (yes I should have done this early on…again my newness to the hobby got me) I’m going to leave the tank fallow (except for the inverts) but how long should I leave it this way? It’s a 20 gal FOWLR starter. I’m also not sure where the ammonia came from (I tested before the fish were dead so I can’t attribute it to the dead fish). My tank appeared to be cycled about two weeks ago. I have a bio-wheel, carbon combo and a power head (plus the LR and sand). No protein skimmer but I am rethinking that (although I don’t believe it would have helped with the Oodinium) I can’t see putting a UV on this small of a tank. Plus I don’t want to kill the “good guys” as they would surely pass through the beam as well. Any advice would be appreciated. I have read the FAQs but still had