I've had the same 2 bubble tip anemone bubble up and stretch out under different conditions and in different tanks , I can't say for certain what causes the change , it seems to just be what suits them , but I noticed more so that its seems affected by light more than flow , much like mushrooms they stretch to expose more of themselves and in my higher light tank they bubble up , but like I said they do both at times under both conditions .
I use led's on both tanks