Way way over kill. I find most sites go over board.
You can cut that in half and it would still be over kill IMO
I have a bio cube 29 and have 5 nassarius, 1 turbo, 3 blue legged hermits and 1 red legged. I have 2 cleaner shrimp, 1 blood shrimp and 2 peppermint shrimp along with my harliquen and pistol shrimp.
Nobody "needs" a clean up crew in all honesty. Water changes, not over feeding and just a well organized maintenance schedule is all you need.