Adam,
Thanks for posting those pictures. It looks like most of them are done with a heavy plastic screen with a pvc frame. Are those pictures of a holding facility or a propagation type setup?
Nano Reefer- The best way to get them off the rock is to peel up the foot with your fingernail or a credit card. When the foot is in a hole it can be almost imposible to get to. I actually had to break a few pieces of rock to get the hard ones off when moving them to the new tank. You can try to get them to move on their own by adjusting flow or lighting. When they are walking the foot is swollen and they are easy to remove. Some recomend ice on the foot. Once I made a whole tray of RO/DI water popsicles and couldn't get one to move with them:) If you can't peel any off the rock I would just turn the rock over on a day you're home and check it every hour to see if they start to move to a spot that is easy to get to them. Then, if that doesn't work try pointing one of your powerheads at them. If you tear the foot a little peeling it of it will probably still make it. Just take your time and a few breaks if it isn't working out. Sometimes they start to move and hour later just from the stress you cause on the first attempt.
Edited by Jeremy - August 01 2009 at 11:45am