How much gravel to buy for a 29gal. tank?

If you want to grow some plants in the future, consider adding laterite to the gravel or just putting in Flourite, a planting substrate.
 
when i got a 20g package from the lfs.. they said to pick out four bags of gravel.. so..i guess mabey.. 25lbs is right
 
Thanks guys, but I already got my gravel. I got a 25lbs. bag. Thank you for your advice it really did help! :D
 
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