stupid question :confused:

Mantis "shrimps" (they're not really shrimps, different Order) -- one per tank.

Other shrimps -- depends on the species. Cleaner shrimp -- usually unlimited. Coral Banded Shrimp ("boxing shrimp") -- one unless you've got a mated pair, then two. Pistol shrimp -- usually one, sometimes can get away with more.

Note that stomatopods ("mantis shrimp") usually require a specimen tank. Usually people put soft corals and maybe a "throwaway fish" or two (like damsels).

Dan
 
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