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So i was thinking of using this Imagitarium Black Aquarium Sand
My question is that in a 55gal corner tank how many inches should I aim for to help with providing another source for beneficial bacteria to thive?

Thanks in advance for your time.
 

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Look for sand that is 20 grain so that it is not too fine and does not harm your filters.

The bacteria live mainly on filter media. It will colonize any surface, so 1/2 inch or 1 inch is fine for beneficial bacteria.
 
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