Planning my 75 gallon FOWLR and I'm on a budget. I have one big obstacle and that is live sand. For 75 gallons it's recommended to have 80 pounds of live sand. However, 80 pounds instantly makes my shopping cart more than $300. I brought it down to 50 pounds and now it's $204, which is fine. Is 50 pounds good enough live sand for this tank? Do I even need live sand for a FOWLR?