Sammy-Well obviusly the best technique would be to take the rock out of the tank and take care of it that way so it doesn't infest the rest of the tank. But if you take time and effort and money for that matter, to take your rock work apart might not be too beneficial. If the rock is easily accessable and easy to take out without knocking the other stuff over, then do it to it. In my case, I got a couple emeralds to mow the lawn so to speak. Might not take care of the whole thing but I'm sure in some instances they do and others they don't. But it give you just another thing to watch in your tank. I have a Strawberry Crab too and it's fun to watch them cross paths. Claws in the air, but never attak each other. It's fun. Then the CB Shrimp acts like the referee. Fun to watch! Especially at night when I use my flashlight on them. IT's almost like they're in the spot light or something and it's a show for the rest of the inhabitants to watch. Oh Geeeeesh, I am addicted to this freaking hobbie!! Sorry for the ramble!!
peace
doug (I really do get out of the house) K.