10-14-2008, 05:39 PM
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So this morning I was looking at the tank shortly after the light came on and what do I see but two odd looking arms/tentacles streching from a rock crevice. At first I thought they were perhaps bristleworms, but the bristles were only on one side of the arms, were much longer - easily twice as long, and were not tapered like normal bristles - more like stalks. I also noticed that they retracted very quickly into the crevice when the gobies swam close. I also noticed what appeared to be a rounded body inside the crevice, but couldn't get much of a good look.
Thinking I was still half asleep and it was just two bristleworms, I went upstairs, took a shower and came back down stairs to put on my socks and shoes. I sat in front of the tank and there wasn't anything in crevice at all. I also noticed that the crevice was more of a hole in the rock, and connected to the top of the rock in question, maybe 1 1/2 inches total length.
So I pose the question: has anyone had experience with octupii hitchhiking on rocks? I keep thinking it sounds outlandish, but it makes sense. I doubt a mantis would/could eat 5 serpent star legs that were each 4 inches long in one night.
PS - should I decide to take the rocks out of the water, how long should I leave them out to kill any critters (mantis and octupii alike), but also not make a huge dent in the bacteria colonies?