Sadly, nothing yet (no tank at the moment). :downcast-face-with-sweat:
If you're interested in getting one, though, I'd recommend reaching out to
@lion king and seeing if he has feeding suggestions. He's basically the resident predator expert, and he's kept a wartskin in the past while feeding it live ghost shrimp. If you buy ghost shrimp from the right source, they can be very cost effective (Blue Zoo Aquatics sells them as "Feeder Shrimp" for a dollar each), but otherwise it'd probably be cheaper to just setup a little 10 gallon and breed your own feeders (be they shrimp, mollies, etc.). Of course, variety is the spice of life, so you'd probably want to feed some fish on occasion, but I'm not sure which ones would be best.
https://www.reef2reef.com/threads/look-at-that-face-new-angler.257508/
He fed his multiple times a week, but on page three he recommends less frequent feedings (once a week, which I believe he still recommends).