Originally Posted by TorontoPlantMan
It says the sand is 0.55-0.65mm sand, do you know which size you have?
Does the size of the sand matter? Do you think 0.55-0.65mm sand is fine enough?
#30 grain sand is about 0.6mm, so the bag is #30 grain.
I have pool filter sand in two tanks and it is #25 grain. #30 is smaller, but still big enough that it shouldn't get sucked int a filter. Only one of the tanks is planted, and it's a low tech tank that is all sand, so I can't comment on using it as a capping material.