Bumping after 16 min? thats kinda impatient isnt it?
What do you mean what do you need in your tank so you dont need shrimp or snails? You never "need" snails or shrimp, they are just good at keeping the tank free of algea and detritus. If your talking about to keep algea out, then get a Algea scrubber, but even that wont be 100%, other things that will eat detritus (food wastes, fish wastes) would be various zooplancton and things like bristle worms, but snails are more attractive then bristle worms and snails are cleaper to replace when they die (assuming they didnt spawn).
Why exactly do you not want snails or shrimp?