I am an avid Anthias lover. I've kept quite a few different species throughout the years and I'm currently on the hunt for a healthy pair of Borbonius.
IMO, Lyretails are the easiest, especially if you have any fish in your tank that might be aggressive towards them. I absolutely recommend getting all females and allowing the dominant female to change to male on its own. IME, males ship very poorly and have a much slower survival rate, however, a female that is allowed to turn male in your tank will be just fine. It's really neat to watch them change as well. The biggest thing with anthias is getting them to eat in the beginning. DO NOT BUY anthias that are not eating in the store, it's a death sentence. They'll slowly die in your tank. I had a harem of 5 Resplendents that slowly withered away because I took the chance on them even though they were not eating at the store. I got them to eat a little in my tank, but they never fully acclimated. I only have one left and he's stuck in my overflow box and will not come out. I've tried everything to catch him and finally decided that if he's comfortable there, then he can just stay in there.
They need to be fed daily. Mine LOVED Reef Nutrition Arctipods. I very much treated them like mandarins, they like to eat, and have a high metabolism, so they need to eat often. Having a refugium helps, but isn't necessary.
Something that people overlook with anthias is the size of the fish in relationship to the size of the food being offered. Very young anthias can't handle PE Mysis, it's just too large for them. However, PE Mysis is really great for them to be eating, so my solution was to put it through the food processor.
Absolutely add vitamins to their food.
As for schooling bannerfish, a 75 if not enough room.
