What if you don't have a sump, which is my case? Layout is exactly like the picture I made.

Oh yeah, I have 12 mexican turbos, 6 astrea, 6 cerith, and a serpent star that is about a foot across. Also have a sand sifting star that hangs out in the front part of the tank. Yesterday I noticed about 4 of the turbos eating up the detritus on one side of the tank. You think having this clean up crew will keep my tank clean enough and avoid any problems where the sand's not getting much flow?