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It is set up in such a way that there is 3/4 " PVC along the bottom of the tank covered in nylon screen, then there is about 1.5 " of coarse gravel, then more screen, and finally a few more inches of mixed ruble, gravel and sand. From under the tank you can see the space on the bottom is clear except for a little sand that has made it through. You think I can remove this all at once??? I was worried that I would be taking out too much of my biological filter too quickly.
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