Hello everyone....I want to make a tank with miracle mud on the bottom and just grow sea grass and mangroves in it and eventually put seahorses in it as well and maybe some gorgs and feather dusters. But I was wondering, can anyone help me on figuring out how many pounds of it I need. I want to make it 3 inches deep and I have a 20X12 area to cover. I was going to use the sand bed calculator but I don't know how much many lbs of mud per cubic foot. If anyone can help me out I would very much appreciate it. Thanks in advance, Fortunato