I've just started feeding my guppies frozen bloodworms, and have a couple of questions. First off, is it OK to just drop a whole worm in, or should I give them small pieces? I tried giving them a whole worm this morning and they basically just grab an end and eat it for a while until it's gone (picture trying to eat a hot dog without using your hands). Also, since my tank is small, I don't use all the worms in each sealed cube - can I just refreeze what I don't use? And finally, do Cory Catfish enjoy bloodworms?