I just picked up a really nice achilles last Saturday. I put him in a QT and he was eating fine for a couple of days. He developed a few spots of ick so I treated the tank with cuppamine. Yesterday, he stopped eating. No interest in food, so I took a chance and put him in the display last night. Today he is pecking at the algae and my wife dropped some brine in there and he was eating again. When I moved him, he had one spot of ick. Hopefully he will stop stressing and the ick will subside. He did not have any ick when I purchased him so i can only assume that he stressed during the transit from the fish store to my QT.
I do not have any other fish in my display tank, just a stingray, so I am not too worried about the ick killing my entire tank. I also have a 57 watt aqua UV running 24 hours and another 40 watt uv on standby if I need it.
I am convinced that this fish would have died had I left him in the QT any longer. At this time, anything can happen, but I think my chances are better with him in the display. I have excellent water quality and conditions for him. Time will tell.
This morning before I left work, he was swimming all over the tank. Breathing normal and looked happy. I hope he eats more when I get home tonight, I will keep you posted and get a photo up soon.
Vince