I rearrange the rock in my tanks whenever I have a good reason. Don't really like to rearrange the rock in my tanks because I like the way they look right now. However........
The 120g has some valonia I need to remove, so that tank will soon come down soon. Will also search each rock for crabs while I'm at it
The 67g has way too much crud for the bioload I added to the tank, so I'm thinking of tearing that one down to do some serious crab hunting
Saw two crabs a couple of weeks ago, and there are probably more hiding out
The 37g has no bioload except for four or five snails and it's got too much crud in it for that small a bioload, so I'll probably take that one down, too, for crab hunting.