Those fish are too small to use a floy tag on. I'd do a minor fin clip, maybe cut a "V" out of a fin on a different spot on every different fish.
I agree with Scott. I've tagged lmb over 10", and they do fine. Maybe it'll work on an 8-10" BG as well. If fish are floy tagged, I'd be sure and check every fish caught for the tags. They'll get covered with algae and can be hard to see unless you're looking for them. I've got a pic of that somewhere, so I'll see if I can find it.
