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#1
07-05-2008, 05:35 PM
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I would echo what many others are saying about a crab or mantis shrimp as I had the same issue when setting up my tank a few months ago.
I had about 70lbs of liverock in a 90 gal tank and 5 chromis. All fish seemed healthy but every couple of nights a fish would disappear by morning. I could never find any of their bodies. One morning I checked the tank and found a dead Gorrilla crab. I figured that it was the cause of all my problems but I kept losing fish after that. I ended up finding another 3 pretty large crabs after that. So as others have said you could have alot of crabs in the amount of liverock you have as I had at least 4 with only 70lbs of liverock. I didnt use a trap for the crabs but i did find that when i fed frozen brine shrimp, i could see crab claws coming out of the rock trying to get the food. I then was able to pull the live rock out and use tweezers and a screwdriver to push the crab out. 
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#2
07-05-2008, 05:40 PM
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Just want to confirm a few things.
1. Have you lost any tangs? 2. When you say refugium do you mean Quarantine Tank (QT?) which is a tank completely separate from the main tank. 3. Using a flashlight do you do you see any salt like spots or any whiteish coating on any of the fish? 4. Are you adding any additives to the tank? Thank you
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