Tilefish are pretty easy IME. I had my purple (see banner) for a couple of years. It survived 3 trip thru the overflow, a nasty ick outbreak, and countless "dings" as he bounced off my halides, but he finally leaped over the 6" eggcrate I had along the back of the tank. Then I got a bluejaw who did great but it only took 8 months for him to clear the eggcrate. So a covered tank is mandatory.

I have 2000 watts lighting and they didn't seem to mind it at all. I do have a group of scissortail gobies and the tilefish always liked hanging out with them. So maybe that helped them settle in and get used to aquarium life, although I've never had much problem with them at the store either.

I have a neon dottyback in my 215 and he does not cause any problems at all. I think one would fit in well with your mix and tank size.