I was kind of skeptical of that also @Byron , I would think that the gravel and the sand would weigh the same? Wouldn’t you?
No, sand is probably heavier. I would think 10 pounds of sand would be a different amount of material from 10 pounds of gravel. I only mentioned the sand previously because I acquire play sand in 25 kg (50 pound) bags, so I know roughly the amount, and this is double what is needed for a 20g, maybe even three times as much.
