Guess I'll chime in. I've had a many anglers over the years. I used to sell them when I had a small side biz (don't have tanks anymore but when I get back in I will setup an angler reef setup first)
So where to start. Yes you can put them in a reef but not if you care about any of your current fish. They can, and will attempt to eat anything that they can...or sometimes can't fit into there mouth. The "if it's bigger then them" doesn't hold water. A few years back I sold an angler to a guy who put it in a tank with a dwarf angle the angler tried to eat the angle, it was to big and they both died. I found the best thing to feed them is blue green chromis (damsels may be cheaper but can injure your angler due to the spines on there backs), or "gut loaded" ghost shrimp (basically feed your shrimp pellets, cylcops ect, right before you feed them to the angler).
SPS tanks.. don't really work to well for anglers, if the flow is to high (ie you have giant tunzees it can be problematic as you don't want your angler get blasted into the side of the tank, rocks or into a grove of staghorns
Another thing that you can do if you don't want to feed them live food is train them to eat freeze dried krill. I've done this with a number of anglers before I sold them. You will need to mix at first, but basically dip your freeze dried krill in cylcops solution and maybe some of that fatty stuff (been awhile don't remember the name) spear it with something that won't injure the angler.. and well.. Go fishing. It can be a lot of fun, and after a while the angler will learn to nab the krill out o the water column.
When it comes to putting a angler in a reef.. Remember to use caution in terms of what else is in the reef. Can it harm the angler (carpet anemones (other very stick anenomes), really large aggressive fish, eels, mantis shrimp ect..)
Other things to be careful of 1) Don't let them get out of water.. EVER. While I have had some get out of water and be ok. It's always a possibility they will get an air bubble stuck in them and die. If this does happen you can try to gentle squeeze the bubble out you will notice them floating.. by the surface.. with an obvious "bubble" protruding there skin.
When it comes to 2 Anglers.. It's very hit or miss. You always risk the possibility of one trying to eat the other so please be weary.
When it comes to bigger tanks.. anglers are stalkers most aren't very active. I have had a few with some "personalities" but if your tank is to big you risk not seeing it very often.
On a final note.. DO NOT DANGLE YOUR FINGER ABOVE THE WATER LINE! A friend of mine thought it was funny that my angler "Fat Tony" was dangling his angler, he wiggled his finger above him and "Fat Tony" swallowed his finger.. Luckily he let go, and nobody was hurt.. but My buddy freaked out flailed his hand and the fish flew across the room and almost hit his girl friend.. .How "fat tony" made it threw it unscathed was beyond me.
Anyways enough with my ramblings.. here are some photos
This was my favorite warty. Had a ton of personality "would jet around the tank" and do little dances when i would feed him His name was "Little Vinnie"
stalking
mid dance
Dangling his Angler
Here are a few I had sold over the years
A random "impressive" Angler I saw at a lfs in fountain valley (Fat Tony looked just like this one)
A warty from Birch (I think)
