Here's a chapter from Fenner and Calfo's book "Reef Invertebrates" http://www.wetwebmedia.com/BookMatte...cnids-demo.pdf
They basically say that they should be placed on a hard flat rock that you can bury in the sand. I've seen this done, but with oyster shells. HTH.
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Mike
"I saw what the governor makes. That's like four hands of blackjack."
-- Charles Barkley on why he wasn't seriously considering becoming the Governor of Alabama
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