I actually under stock sand so to speak, I have a min. amount of sand and stir it every couple weeks. I have a 30 gallon tank and I think 15 pounds of sand. I can't remember LOL. My cories, turn the sand as well, my sand ranges from 1 inch to less than one inch. I have the sand built around my amazon sword (Which is dug up Every week by my cories) I also have been rearranging decor because I just moved everybody over from a 20 high. I use my gravel vac and all the yuck (poo, plant, etc) I was considering Malaysian Trumpet snails, but I hear they are very hard to get rid of. I do 50% water changes, yesterday today I did another 5 or so trying out my new gravel vac, top fin from Petsmart.
I also have a little less than a cm of root at the base of the amazon sword sticking above the sand. I use liquid ferts and I noticed they like it better that way.
Fish in Cycling