I'm thinking of pulling my 2 in sand bed from my ceph tank (no octo yet - want to make sure all is PERFECT first!) I've heard that unless you have at least 4-5 in that it really doesn't do any good anyway in the way of good bacteria - True or not? A bare bottom may not be quite as esthetically pleasing, but MUCH easier to keep detritus off. Beside it will be covered with coralline in no time. If I pull the sand now (my tank has already cycled and been running for about 4 mo now) will throw the balance out of whack? Will an octo be okay without substrate? I will still have 80lbs of live rock of course. Thanks for any input!