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Old 09-10-2003, 07:22 PM   #11
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Well my vote is for predation, not muxch help, but there you have it. It is most likely a mantis shrimp or a nasty crab. If your fish are disappearing at night, that is when you need to go on a stakeout.


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Old 09-10-2003, 11:13 PM   #12
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so what do you think i should do. Wait a couple hours after the lights go out and use a flashlight to see what is going on. I did that tonight and say my emerald crab out walking around. Also about how big are mantis shrimp. So they only come out at night? And if that is what it is how do i get rid of them? Is there a way to trap them. This has got to stop. Whatever it is it is destroying my fish and it is upsetting me very much. Thanks for all of your guys help.

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Old 09-10-2003, 11:58 PM   #13
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i've seen traps for sale at my lfs especially for mantis shrimp. i'd call around to every store and see who carries it so you don't waste any time. sorry to hear about your fish!
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Old 09-11-2003, 12:10 AM   #14
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I have heard the same mysterious noise in my tank .. no missing fish yet thank the gods, but, because of the noise i have been doing some reseach. It could be a mantis shrimp or less likely a pistol shrimp or that emerald crab. From what i have been reading a Mantis shrimp makes a sound like something tapping against the glass several times like two or three times in a row and a pistol makes a the same sound but only one at a time. ( this isnt a rule just a typical behavior) A suggestion I liked was to put something meaty that will hold together in a corner of the tank where you can see it and then a few hours after the lights go out take a look in the tank with a flashlight. Mantis shrimps are ruthless predetors great for the ocean but generally bad for our reef tanks. Even taking all your rock out will not bring him outta hiding they are whilly little creatures and are very very smart. Also, there are mantis traps avalible. From what i have read it sounds like it is a strong possibility that this is what you have. I would try to quarentine your emerald and see if that stops the killings. Hope that helps. There are lots of awesome articles on what to so if you do have a Mantis.

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