This is normal, my rose does the same as well as every other BTA I have kept. What they are doing is "flushing" their tentacles of water, and re-filling itself with new fresh water if you will.. a normal process. Sometimes you'll notice they don't always do it, and sometime more than others. If this is the case, water quality may be a factor. But generally, they are just flushing and re-inflating with new water.
Scott
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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