NOT necessarily destined to fail ive kept small salt tanks with nothing but about a 5 lb. piece of live rock, a small ammount of live sand in the bottom 1 small power head, and only one small fish. The Key...VERY low stocking compared to biological. I started with sand, R/O water, The rock, mixed the salt 1 cup per gallon per instructions on sea salt. Let run for a couple of days with power head only, put in 1 clown fish... Ran for over a year no problem finally added a red shrimp. Did monthly water changes with R/O, Ran til i took it down. Your mileage may vary 
