For Bare bottom tanks
If you are prolonging your water changes and want to suck out the crud in your tank siphoning out the crap and have a filter sock in the buck to catch the crap and when your done take out the sock and pour the water back into the sump. 
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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