It's a pistol shrimp!!!
Acually, It's two Pistols.
Finally after many weeks of clicking I caught them chillin out together on my Live Rock. beautiful red guys too.
I am just so glad it wasn't a mantis!
Hardware: 37 gallon SW
tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.
Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.
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Central Illinois Marane Aquarist (CIMA) member.