How Much Pea Gravel?

[CletePurcel]

I have ordered a new 200 litre tank and want to put pea gravel in it (5mm).

How much should I get? This will be on top of Tetraplant substrate.

Any ideas? Cheers.

 

[CletePurcel]

I just found a gravel calculator for different types of substrate:

http/www.aqua-calc.com/calculate/gravel-rectangular-solid

Says I need about 18kg of pea gravel per inch of height.