What CUC member for cleaning substrate in a freshly cycled tank?

My tank has finally finished cycling and I have brown algae and even coralline red and pink algae in my tank (which is pretty neat !!). I already added two snails from a LFS but they won't touch the substrate. I read that it's not wise to add hermit crabs to a new tank as well as brittle stars so what options do I have? My substrate is just 1" deep.