You couldnt really culture them in a bottle out of tank, as one or two of the assorted verieties would become dominant and wipe out the rest (and probably die off if you don't feed it the right stuff) but it wouldn't be a bad idea to add them to the tank/fuge as a "starter" for your system to hopefully introduce a population of various things (though you'd probably have to add more every so often, as some likely wouldnt make it.
If you want to culture, find a "pure" sample of one or more types, that way you can tailor the conditions/foods to that breed increasing survival/breeding rates.
your corals will eat what ever lands on them if the corals mouth is big enough to do so. BUT they wont eat all or really all that many, as they can't actively seek them out. Also i recomend adding pods at night, with the lights off, so that the fish don't have time to snap them all up (not litterally but they could get a good chunk of them) before some can hide (and hopefully start breeding).
