Get a copy of Reef Fishes, Volume 1 by Scott Michael. It has a great chapter on anglers. I've kept them for several years, very cool fish. Keep the water very clean, temperatures below 80, not too much flow, vary the diet. It may take a while to train to frozen. Some species make better display specimens than others. I like A pictus and A antennarius. A striatus and A hispidus are nice, but get around 7-8 inches. If you want a less expensive one that is very cool, get a Sargassum fish (Histrio histrio).