How many lbs of gravel do I need for a 72 gallon bow?

[ScottyNorq]

Any help so I dont have to go to the store twice

 

[nickmcmechan]

40

 

[ScottyNorq]

thanks!

 

[Mgamer20o0]

http://www.plantedtank.net/substratecalculator.html