A Guide to Clean-Up Crews

anyone got any good reccomendations for a clean up crew for a 5G?
 
Got snails?

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I am so at loss, i don't want to mess up. what would you guys put in a 12 US gallon? Right nmow, i have a single turbo snail. I also LOOOOVVEE hermits/crabs/shrimp
 
I have 2 sandsifting starfish. They are doing a wonderful job with the algae in the sand, and I think they're trying to mate. Would a red-legged hermit crab be likely to attack my stars?
 
I know someone mentioned in the begining that blue legged hermits have a comparatively bad temper to red legged hermits, but I have yet to see this problem, and I am keeping assorted types of snails with my hermits and have yet to loose one. If anything, my blue legged hermits are afraid of my emerald crab and turbo.

Just my two cents.
 
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