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Old 03/21/2017, 06:33 PM   #4150
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Join Date: Mar 2002
Location: Mountain View, CA, USA
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Originally Posted by jweist View Post
Some people believe that when you have a clean tank and rocks, any excess nutrients will get sucked into the rocks.
I'm not sure what is meant here. It's not making any sense to me yet. I agree that diffusion won't do the job. Bulk flow will move water through the sand to some degree, but only phosphate will bind to the sand.

Jonathan Bertoni
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