How much sand is needed?

I used 100 lbs for my 150gal. african tank, 5'x2' footprint, gave me about 2"-2 1/2"
add enough to make yourself happy.(I'd keep it 3" or less myself ) Sand rocks, I love it. To prevent rock piles from falling, place the bottom of the piles/stacks ON THE AQUARIUM BOTTOM so the fish don't dig a sinkhole under your rockpile foundation. Have fun!
 
i have an inch and a half in my 55g with eggcrate underneath but i need to add more cuz they are digging to where you can see the crate. i put 3-4 inches of sand in my 10g with the multies and im haveing to stir the sand and i occationally stir free a small bubble which scares the ever living hell out of me.
 
thanks all for the suggestions-I went with 100lbs. of sand and I'm happy with the results:thm:...

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Yeah I would want something between 2 and 3 inches generally - those little buggers will soon let you know if they prefer it arranged some other way though :D
 
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