I have one in a rock. He hasn't seemed to move for a while and is always inside this one rock. Should I try to remove this guy ? I keep reading about these guys killing off tanks. I'm scared to mess with him. Thanks
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Are you sure were talking about a " Cucumber " here . Cucmber's come out at night ( when all lights are off ) and stretch out along the sand bed to eat/sift sand . The only way I could see him staying hidden in a rock after lights out is if he was being picked at . Sounds to me like your talking about a bristle worm . Did you purchase the cucmber and add him to your tank ? Got a picture ?I have one in a rock. He hasn't seemed to move for a while and is always inside this one rock. Should I try to remove this guy ? I keep reading about these guys killing off tanks. I'm scared to mess with him. Thanks
Yes the above is true...........but they should come out at night , they do not eat prepared foods , they only sift sand . Would still like to see a picture for a positive ID .He's definitely a Tiger tail. There were 3 more in the tank. I bought the rock from someone who put them in his tank. I have read that if they are crushed they release a toxin that can wipe out everything, and that they can turn themselves inside out if dying ? /Users/ejohnson19396/Pictures/iPhoto Library/Originals/2009/Aug 16, 2009/DSC01253.JPG
Ok......looks like a cucumber,at night when all lights are off try and see if they come out to the sand bed , hopefully you have at least a 2 inch sand bed . they must have this to survive . As I said before no cucumbers eat prepared foods , they need diatoms , fish poop , ect ect . In short they eat the sand and swell up . The sand inside them is then striped of all organic matter then pooped out into a pile of pure white sand .I think he's a Tiger tail. There were 3 more in the tank. I bought the rock from someone who put them in his tank. I have read that if they are crushed they release a toxin that can wipe out everything, and that they can turn themselves inside out if dying ?![]()
The only advice I can give you is to keep an eye out when the lights are off , he could be eating junk in the hole . If he starts to shrivel up pull him out and dispose of him so he doesn't pollute your tank . Your better off being safe than sorry later .Sometimes those little thorns on him seem to disappear also.

