how many lbs of gravel for 20 gallon tank?

[ForFish]

Like the title says, how many lbs of gravel would be best for a 20 gallon tank?

Thanks in advance!

 

[1998golfer]

20 gallon long or tall?

 

[mikem691]

I would say 15 to 20 for a tall and 30 for a long

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[icydeath]

Calculate gravel and sand coverage in a rectangular aquarium

I always just used this.