Never have owned one but I would like to in the future. Any fish that's smaller than it is food ,along with fish up to 2x its size. They are recommended for tanks around 30 gallons. Their is a list of tankmates that can live with them but its extremely short. Anything like a trigger, puffer, or a fish that picks at rocks might pick at, harass, or tear off the esca of the angler. They also usually only consume live feeders like ghost shrimp and chromis but should be weaned onto frozen ASAP. They also can literally be fed too much that the food sits in its stomach and rots. Most of the time they are put in a species dedicated tank with corals and sessile inverts. But overall I think anglers are one of my favorite fish, one that I hope to own someday.