That seems like a lot to me. How are you going to keep track of all those creatures? I don't know about you, but I want my CUC to punch a time card every now & then. If your tank isn't an absolute mess to begin with, you could end up with quite a few casualties IMO.
Assuming your water quality IS up to par, you might want to consider something like 10-12 Banded Trochus snails and maybe 5-7 Scarlet Hermit crabs. See how they do for awhile and hopefully if things go right you won't have to add any more janitors down the road. Don't forget, you can keep the glass and the sand clean all by yourself. GL.