I have a good size rock that has some palys on it that I really don't care for. They have taken over the rock. I'm tearing my tank down this weekend to move so I figured what better time to get those palys off of the rock. Question is how do I do that and after I get them off is it safe to put the rock back in the tank when I set it back up. Tearing the tank down and setting it back up all on Sunday. Thanks.