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#1
01-25-2013, 10:24 PM
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I vacuum about 1/4 of my bed with each water change. I installed a PVC valve in my gravel vacuum hose and I can use the valve to keep the flow at the right amount to get the black junk but no sand.
I have always done this so no experience with whether it actually makes a difference. I get a lot of gross looking stuff out though so it must do something. 
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#2
01-25-2013, 10:47 PM
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i vacuum wherever there's room to. i remove a lot of the fines and i'm guessing over time the ratio of debris to fines will shift as the fines are depleted.
i dig in all the way to the bottom and make sure any gasses in the sand get sucked up then let the sand settle back down where it came from and move to a new spot. my sand bed is maybe 1" deep on average.
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#3
01-26-2013, 12:53 AM
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I used to, but I have a burrowing fish and he seems to do a really good job of keeping the sand stirred up, but I shifted the sand around in the tank (another fish had been trying to build some kind of a burrow, and heaped the sand in an akward spot), and there wasn't really that much gunk that came out of the sand. From when I first started the tank I vacuumed every water change, and I havent really noticed a change from when I stopped, just extra work.
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