Strange sounds from LR

[diver_ua]

My tank started since 8 months ago. About 3 months back I've become to hear "click-click" sounds.

At first they began at the deep night, but now I hear them during all day (MH light is on).

I think that sounds (one or two clear "click") are heard from one of my big LRs.

Is it possible, that Pistol Shrimp (Alpheidae) was growth in my tank from little germ or egg?

 

[onereefnotenuf]

i don't know about the egg part but mantis and pistol shrimp will hitchike in liverock. i have a pistol in my tank and so far it only eats mysis shrimp. a mantis is a worse problem.

 

[diver_ua]

I see, but first 5-6 months I heard no sounds at all

 

[tinypieceofkrill]

It is probably a pistol shrimp. My pistol shrimp didn't make much noise for many months after I got it. Now it makes noise all the time. I have a mantis and a pistol, the noises made from a pistol shrimp are much different from the noises made by a mantis shrimp. Also, by now you would probably know if it were a mantis shrimp.

 

[diver_ua]

I've heard that mantis make few short knocks. It is not similar sounds from my tank.