Well, because I apparently have trouble learning.... and I like to take short cuts when available, I have to clear the fish out of my tank.
When I brought the powder brown home, he looked a little stressed, but things cleared up overnight. He'd been at the store for a few weeks and was acting healthy. I left all but the actinic lights off the next day and he looked great. He had a few flecks of ich, but he was eating well and I was soaking his food in garlic. I was sure he'd get through it. Then a week or so ago I got the notion to go ahead and add my yellow tang. Boy, the powder brown was not too pleased about that move! The PB was really harrassing the YT, so since I eventually wanted to add a total of 3 yellows, I thought I'd go ahead and do that now and spread the aggression around a little.
So, I buy another couple of yellows that look healthy and have been in lower salinity since May. Over the next few days the aggression really seems to improve. Though, ich has started to flourish. I started thinking about removing them for hypo treatment, but there were so many now that I didn't really have way to treat that many tangs.
Well, today, my space issue seems to be resolving itself. I've lost two yellows in one day. The first was dead when I turned the lights on. The second made it about halfway through acclimation into the quarentine tank. I think he was pretty much done to begin with since I was able to net him without any effort. Though, it's tough to lose them back to back like that.
Now, I have to figure out how I'm going to QT a hippo, powder brown, and a yellow tang and a lubbock's wrasse. I have two 10g tanks ready, but that doesn't seem right on the tangs for that long of time.
I really do think ich is going to be present in any tank, whether you get it in on a fish, coral, rock, or sand, but I need to try and limit my exposure since I want to add a powder blue and other ich prone tangs at some point.