04-04-2007, 04:57 PM
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I have 4 starfish and over 1500gals/hr being pumped though the rock work, so what happens is that all the waste is either eatin or gets sucked into the over flow box's and into the sump to be skimmed out. Most reef keepers have a 3" or more sand bed and that is also another way of filtering the water. A deep sand bed breaks down nitrates into a gas form which escapes the sand bed and escapes out the top of the tank. it is not good to desturb a sand bed deep as it will release toxins and make a tank crash. Now if its less then 3"'s then you wont do any harm siphoning out the sand, but I believe you might remove alot of benificial bacteria doing so.