Hi ca1ore,
What did you decide to do about the Hippo?
Great tank and fish selection.
I'm currently of the process of filling my tank with life, fish corals, inverts and am interested with how you will proceed. Don't want to derail your thread, but current "conventional wisdom" would say remove all fish QT everything again and let go fallow.
I don't quite believe that the best course of action, but I also don't want to fuel the flames on your tank build.
No, it's an excellent question .. to which I don't have an excellent answer .....
The hippo has been showing up with periodic spots now for quite a while (probably 2-3 months), and while it did flare up a bit more than usual a week or so ago, I tried using Dr. G Anti-Parasite Caviar, which, for now, seems to have calmed symptoms. No other fish have shown any symptoms. Pretty clear that I do have ich in my tank though!
So, for now I will just 'manage' it through a combination of heavy UV and skimming, excellent water quality, and judicious use of the anti-parasite food. I say judicious, because it contains chloroquine phosphate which will do a job on your inverts if you aren't careful. I don't discount the possibility (probability) that I may eventually have to remove all the fish to a treatment tank and fallow the main display, but that will be a major logistical effort that I would really like to avoid, so we will see (I am seeding a significant amount of biomedia in the sump just in case).
The Naso that I recently added had been in my QT system for 12 weeks and really needed to be freed from the confines of a 20L. Not ideal to add it to a likely infected tank, however, the alternative of keeping it in QT seemed even less appealing. The other fish I have in QT, an Achilles Tang, is in a 30L setup as a full reef tank (the AT is through all meds, so just now fattening up), so it can remain there for a while. Adding an ich-magnet like the AT to my display seems most imprudent.
Although my longer-term plans call for a few more fish, I won't be buying any of them until I have a more clear resolution to this ich issue.