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If you start to notice shells piling up in a certain area of your tank it would likely be a pistol shrimp. They like to collect building materials for their burrows. However, you have an orange spot goby which I believe could be symbiotic with pistols. So if you haven't actually seen the shrimp with the goby, you might not have one. Perhaps the snails theory is more sound.
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
http://www.canreef.com/vbulletin/showthread.php?t=55041
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