I've got a 110 gallon tank setup with a sump filter-protein skimmer to be added soon-. Currently I've got about 50lbs of live rock, and about two inches of sand. I've been told one pound of rock per gallon but I read on one of these forums that for an octopus you should have two lbs anyone confirm this? Also I've read that some octopi will rearrange live rock and that it can break glass, Has anyone have a problem with this or do you simply anchor it somehow? I'm trying to figure out the set up a little better before I keep adding rock in. The tank is just about a month old, has some snails and hermit crabs inhabiting it right now..though I'm aware they'll be snacks when I finally decide its ready for an octopus. Thank you all for your help =]