I have three, two large and one small, I've moved them around a lot even buried them in the sand completely, they will move within the sand bed and extend as much as they require according to the flow etc, best to leave them partially submerged in the sand bed and let them do what they do, my small one doesn't extend much at all but the two large ones extend approx 3 inches out of the sand bed. The coloured tentacles on the large ones are approx 4 to 5 " with a 1' diameter tube, the small one has 2" to 3" tentacles with 1/2" diameter tube, blah blah blah at the end of the day they are very hardy and will do their own thing. LOL
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