I qt my fish for 2-3 weeks with copper and dip my corals. Got burned once(velvet) and dont want to again. I wish more lfs would do it as I wont have a qt tank for the new place so it really narrows down where I will be purchasing new fish.
I have to keep tangs in my tanks as they are my favorite fish with tons of personality. IME they havent bothered other species fish. My sailfin and purple did fight a little at first but now they wont leave each others side.
Im also a firm believer in every tank having ich though. It is just way too hard to keep out of a tank with the extremely long incubation that it can have. I tried extremely hard to make an ich free system and still ended up getting it(i believe it came in with coral).
Here is what I did and do now- I kept my tank fishless for about 2 months or 9 weeks. I even used a uv on the dt that I borrowed from Andrew(secretweapons) I had all my fish in a large rubbermaid tub with copper. I tested copper every water change for the qt to make sure I had the right levels. After the copper treatment I then returned the fish to the display and would qt every new fish in a 10 gallon basic setup I continually kept running from water changes on the display tank. I would dip my coral for about 10 minutes in kent tech d. Even though it said to only do 7 minutes and would usually boost the dose up quite a bit more than recommended(didnt bother the coral and I could see snails and pods after the dips so I knew it was working.
Even after all this I still have ich in the display and I assume it was transferred in on a frag. If I did it again I would setup a frag tank and dip the corals prior to placing them in that then leave them in there for another 3 weeks at least. I tried to find the website I came across that ran experiments on how long ich can stay dormant as I remember it was alot longer than 9 weeks but couldnt find it. If I do come across it again I will post it up.
So after all this I am now relying more on controlling ich than eradicating it. Hence the turbo twist 12x I will now use with the new tank.
Kevin- 375 Gallon Reef
Reefing made easy...