There's no reason to get snarky, guys. Damon's got the right of it. You can't figure # of substrate/gallon. You have to figure type of substrate vs. foot print. A twenty high is going to need less than a 20 long. Think about it. The volume of 5# of sand is a lot less than 5# of river gravel. It's a lot like which weighs more: A pound of feathers or a pound of gold?
Bottom line it needs to be worked out in cubic inches to be covered, covered by cubic inches per pound of desired substrate.
rav
Last edited by Ravynnm; 10-06-2007 at 09:56 PM.
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