How much sand?

[SparkysBois]

Hi all I have an Aqua One 620 90L and was wondering how many kgs of sand i should get to put in it as i am ordering online.
Thanks

 

[connorlindeman]

I would get 3kgs just to be safe. You should have a 3-4in layer of sand in the tank.

 

[casseedy]

maybe try a gravel/sand calculator and add your dimensions!