It seems to be irritated. Sometimes this will happen from changes in flow (pointing a powerhead directly at it) or rapid changes in water parameters, especially salinity or alkalinity. IME, anything more than a few hundred gph of flow directed at torches is too much and completely unnecessary. For example: I ran a jebao pp-4 (1000 gph) about 12” away from a torch colony. Anything above 30% power would make the heads contract as shown in your pictures. Of course all colonies are different and I’ve had colonies in the same tank that didn’t mind high flow. I also never saw a benefit to pushing more flow past torches either.
Sent from my iPhone using Tapatalk