Just a word of caution with them: I have found them to be one of the most exciting fish to feed feeders to, but don't!!
I had a huge black one (must have been 10"), as it showed up by accident in a shipment at my LFS. I picked him up, brought him home, and kept him for 2 months. He ate really well on frozen shrimp and small frozen fish like anchovies, sticklebacks, etc., (used a piece of wire to bat around the the thawed out food and make it seem 'alive' in front of him, as he would never pick up a piece off the ground). After a long time, I came to the realization that I couldn't really mix anything with him except other lionfish, as most shops don't carry fish big enough for him not to swallow. They got a small black/white one in, so I traded him straight up. Well, this guy would NEVER eat shrimp, or anything else for that matter. Eventually I succumbed and fed him some live GOLDFISH. Well, he ate 4 of them, then started swimming around like a jack. Knew he was a goner right away. He finally stopped swimming, settled down on the sand, and breathed slowly for the next 3 days. On the 4th day, he was in exactly the same position, only he wasn't breathing anymore. Left him for a few hours 'just to make sure', and he was definitely dead.
Cause? Probably goldfish. I am sure he was a bit stressed to begin with, but the goldfish definitely sent him off quicker. Even my lionfish would turn white on the days he was fed feeders. Never, ever feed your marine fish goldfish!!
Definitely exciting watching them use their lure and the suspense of having the goldfish pass by that super-speed mouth, just waiting for the strike... pretty exciting! Buy a damsel or something if you really want to see it
