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High flow lengthens tenticles.
My Duncan came with long tentacles just like yours. I think they get that way in lower flow as mine has now gotten shorter tentacles in the higher flow of my tank. The kinky/twisted look of the tentacles of your's tells me that they're going in that direct(shorter) as that's how mine looked in between long and shorter.
That makes sense as I do have a good amount of flow in the tank... it keeps growing heads and is colored nicely so not going to change anything

