ill bet Wit is right sounds like a cowrie. The animal will come out of the bottom and completely cover the shell. Maybe what you are seeing is the animal retracting slightly exposing the shell. Here's a link to a bunch of cowries, you might try picking him up or distrurbing him to the point he retracts fully into the shell- then look at the pics and see if you can ID him. If it is a cowrie, they are harmless algae eaters to us but may pose "bulldozer" problems in a reef http://www.oceanlight.com/cypraea.html
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John
Tank: 29g glass Pumps: Mag5.0 return - (3) rio 100 PHs Lighting: (1) 150w XM 10K/(2) 30W actinics
Equipment: Aqua C Urchin skimmer- CPR Fuge, Titanium Heater -Red Sea wavemaster Pro
Tank: 210g 1/2" Acrylic, dual overflows, 75g glass sump w/ 20g fuge. Pumps: Mag24 return - (2) MAG24s running 2 closed loop systems. Lighting: (3) 400w XM 10K/(2) Custom Sealife 96w PC - 25w dimmable incandescent Moonlight
Equipment: Aqua C EV180 skimmer - CR500 calc reactor - Titanium Heater -
AquaLogic single Stage Temp Controller - Aquanetics 1/5Hp Chiller - Neptune sys aquacontroller
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