Scolymia receding during day

[Etern1ty]

Hi all, I have a problem with my scoly. During the night it is nicely puffed up and accepts pellets, however in the morning when the lights turn on it starts to shrink quite a lot. Other corals are all fine, only this scoly bothers me.. I am using the BRS LPS light setting for hydra26. I have also tried to place it in a shaded area and on the rocks aswell without any success. :(
Do you have any idea what could be the problem please?

 

[reef lover]

Low light and low flow. I'd keep moving it till I found its happy spot.