I chose the marble chips for the gravel bottom of the tank. This bag cost less than $4 and for our 10 gallon tank I only used about half of it. The size of the gravel varies from 3/8″ to 3/4″ in size. I read that the size needs to be big enough for your creature to not swallow it.
The gravel had lots of dust on it. I did not want that to transfer to the tank so I set up a cleaning station at the sink. I cut a square of the plastic mech to place over the drain so gravel wouldn’t get caught in our sink pipes. Then I took a plastic bucket and drilled holes in the bottom of it.
I took a large old towel and folded it in half on the floor. Then I took the wet gravel and poured them onto the towel. I swung it around a few times to pull the water off. I then positioned the tank where I wanted – do this first because it will get heavy and you don’t want to break your back moving it later. Still using the towel I lowered the gravel into the tank and let it pour out gently as not to crack the glass bottom.