RFA's are acting really funny?

[Korkuc36]

They keep taking turns standing up and closing. One will be raised like a flower and the other will close. Then they will switch. Been like this for a few days now. The little one on the bottom left is just minding his business being normal lol. Can anyone possibly explain what's going on? Are they dying? Breeding? Expelling?
Ammonia 0
Nitrite 0
Nitrate 2.5
Phosphate .05
Alk10.5
Calcium 440
Magnesium 1300

 

[blaxsun]

Could be feeding or expelling something, or it's possible a snail or crab brushed them (mine will occasionally close up when something annoys them). I have ten at last count, and they all have their own personality quirks it seems.