I just got a small crocea (just over 2") and I understand I should feed it. I can't take it out of the tank, as soon a I set it down it attached itself to a rock that I can't move. I've read that they need to be fed phyto, but is there anything alse I can feed it, i.e. cyclopeeze, rotifers, or are those too big? If I have to use phyto, how often do I need to feed it?