My 20g long has been doing great for 4-5 months, with monticaps, birds nest, a clam, a red flower nem, hammer, shrooms, zoas, and xenia. I dont have fish, but i still have a skimmer. Filtration cpr fuge with macro, hair algea, and mangroves. Also my diplay has a deep sand bed 3.75-4.5 inches. Maintenance top of twice a day, dose 2 part kent nano-reef part-a part-b, clean skimmer and 10% water change every two weeks. This is just what works for me.