IMO, you should consider snails livestock and try not to overdo it. They depend on algae growth to survive, so you don't want them starving to death.
I have an Emerald Crab and an unidentified nocturnal hitchhiker crab in my 5.5, and while I haven't outright noticed any issues with them (and have seen the hitchhiker eating algae) the growth rate of my zoas isn't very good.
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Calvin
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Planning a 29 gallon mixed reef...
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