New to saltwater

[rollingstones420]

Mantis shrimp... are they the ones that crack fish in the head with that spike? I got the lobster idea because big als just got a shipment and J&L has one, so I'm not impartial to other suggestions. I'm currently reading "The Concientious Marine Aquarist" for the basics of marine fishkeeping. I do like species tanks. I have a couple of piranha species tanks. The guys at J&L said fast fish could survive a reef lobster so would they be talking about fish like some chromis or damsel fish? Thanks.