A large cleanup crew isn't needed. In a couple of weeks when your algae problems subside they will either kill each other for food or just starve to death. Finding the correct balance takes time and in my opinion it is better to err on the side of your crews health/lives. I think I would drop the hermits and the urchin. This urchin really needs good water quality and in a new tank that can be hard to maintain. If you are going with a sand bed you might want to look at Nassarius Snails, less destructive than hermits and lots of fun to watch.
Scott
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