I think "aquascaping" was what really set my tang off. My intent wasn't to aquascape though. I was trying to catch the mandarin.

So far all of my surviving fish are eating well. Those that were showing signs of ich are showing improvements as well. The only digression I've noticed it that my lawnmower blenny has started flashing. I haven't noticed any spots though.

Thanks for the links and discussion everyone. This thread is proving immensely helpful.