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Old 09-23-2014, 11:45 PM   #1
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Fish disappearing?

I've had a total of 4 fish just disappear.
1x lawnmower blenny
1x bangaii cardinal
1x blue-green chromis
1x bicolor dotty back

All the fish were fat and happy prior to disappearing. All my SPS and anemones are happy and have good polyp extension. No jumpers and none of them made it to the sump/overflow. I honestly don't know. This all is happening recently. I had a giant sally lightfoot crab I haven't seen in a while. Could he be the culprit?
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Old 09-23-2014, 11:48 PM   #2
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As with all crabs, they are opportunistic feeders, so it is possible. How long have they been missing for? How long were they in the tank? Any pets that could've snacked on the fish if they jumped?
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Old 09-24-2014, 12:03 AM   #3
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Quote:
Originally Posted by Oscarr19 View Post
As with all crabs, they are opportunistic feeders, so it is possible. How long have they been missing for? How long were they in the tank? Any pets that could've snacked on the fish if they jumped?
My tank is covered with glass tops and has a canopy. And the only holes are in the back and the wall is right against the wall.

The fish have all been gone for 1-3 days. The blenny a little longer. I've had them for 2 months and the previous owner of the tank had them for an unknown amount of time (he had the tank for 1 year)
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Old 09-24-2014, 12:13 AM   #4
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I wouldn't be surprised if the blenny is still in there somewhere. My old lawnmower would go missing for a few days and then I'd see him poking out from a rock.

Other than that, I'm not sure. Have you tested your water recently?

Maybe someone's else has some other theories.
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Old 09-24-2014, 12:57 AM   #5
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What size is/was the crab the last time you saw it ? As Oscarr said, they are opportunistic and the larger they get, the more aggressive they become and more of a chance it could be the culprit.


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Old 09-24-2014, 08:58 AM   #6
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It was about 3 inches across. Maybe a bit more.
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Old 09-24-2014, 05:34 PM   #7
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This weekend I'm planning on breaking down the tank this weekend to get the crab out. Do you think this will have adverse effects on my anemones or SPS?
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Old 09-24-2014, 07:33 PM   #8
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Just wondering what other inverts you have? I experienced a few "mysterious" disappearances a few years ago, turned out to be my rather large brittle star. I actually witnessed it grab a perfectly healthy green chromi
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Old 09-28-2014, 12:48 PM   #9
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I dont really have anything else.

Another fish down today. Most of my stock is gone. Does anybody else have ideas? I'm tearing the tank down today and trying to find the sally crab.

After that I'm left with just tearing down the tank and starting with new rock and try to find someone to babysit my fish or coral until my tank cycles
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Old 09-28-2014, 04:29 PM   #10
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After tearing down the tank, all I found was my sally crab, dead. So this doesn't seem to make much sense. Not sure if I should just restart the whole tank.


On the brightside, I found my bicolor dottyback in my overflow.
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