LOL just this weekend I had fun doing that. Fed one Friday night, didn't dump it. Maybe an hour later, fed another one. Gulped it.
I was amazed! Then, maybe another hour later, OMG !!!
My 4 color BTA was hanging on the glass, near the top, so feeding it the little stars was easy. Some time after the second one, around 11pm, it started stretching like crazy, a sure sign of a split. Next morning, I had two BTAs!
A tiny one at the top, and the larger mass went down to the bottom. Now, the little guy took an asterina, tasted it, then chucked it. Haven't tried giving one to the bigger dude at the bottom.
I also have a huge Condi nem that eats anything - I usually feed him tiny pieces of raw swordfish that I cut up into cubes 1/4 by 1/4 in. I have "dropped" asterinas on him before on a tentacle and it did pull it in. Didn't notice if swallowed, not like the swordfish chunk, that goes right in.