How high can you get on sand?
Nope, not snorting the Carib Sea yet, but I'm trying (largely without success) to design a cool layout for my next tank and it is besting me. I want the substrate to slope from back left forward and sweep to the right. It's a 20 gallon long with a rim so it isn't very tall. I would like to make the high point of the sand 5 inches or so. Is it safe to pile up that much sand or should I use something under it to take up space? If I need something, what do you recommend? Styrofoam?
I'd appreciate your insight!