03-05-2012, 08:03 PM
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The old rule of thumb is one pound per gallon; however, I saw a formula that says multiply the length in inches by the width in inches of your tank, drop the last number and that is how much you need in pounds for about a 2 inch average depth. For example, a 10 x 20 tank would need 20 lbs for a 2 inch depth of gravel. I think that latter makes more sense. Using the pound per gallon rule, I always wind up needing more. Also, some people think that larger tanks, like yours, need a deeper layer of gravel to look good.
Last edited by fish monger; 03-05-2012 at 08:06 PM..