There are a number of things it could be. Mantis and pistol shrimps get blamed most of the time. But I've heard similar noises from clown fish that will making a snapping sound with their jaws from time to time. Additionally, I discovered earlier this year that blue leg hermit crabs can make similar sounds as they attempt to violate each other for their shells. I was sitting by my tank and heard that dreaded clicking sound and jumped up to see what it was. I discovered it was a hermit crab violently tugging on another crab trying to evict it from its home and hitting the shell on the glass of my bare bottom tank.
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SPS Dedicated 24x24x20 Trimless Tank | 20 g Sump | Bubbble King Mini 160 Protein Skimmer w/ Avast Swabbie | NP Biopellets in TLF Phosban Reactor | ATI Sunpower 6 x 24W T5HO Fixture | EcoTech Vortech MP20 | Modified Tunze Nanostream 6025 | Eheim 1260 Return Pump | GHL Profilux Standalone Doser dosing B-Ionic | Steel Frame Epoxy Coated Stand with Maple Panels embedded with Neodymium Magnets
"Mens sana in corpore sano"
Last edited by Canadian; 01-17-2010 at 04:04 AM.
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