My first set of fishes died of ick except my flame angel fish. I believe you are suppose to leave the display tank fishless for a month or so but I didnt. My flame angle was there and I added a clownfish a few weeks later. I never had ick again so for some reason, the ick was dieing from something. I do beleive that the
UV did it. Who knows.
I have a 9w turbo twist for my 72
Gal tank.