Weird LPS cycle going on in my tank

[Animal Chin]

Thoughts on this?

I have a lot of meaty LPS coral, brains, donuts, scolys, trachys,ect. So the lights come on at about 1 PM and they open big and full, look great but every night at about 7 pm they start to shrink. Like something is triggering them to recede and I can't figure out what. I've tested Alk and its pretty steady at 7.8. Could my lights be too strong and after being under them for 6 hours the corals are getting angry? My sps are all fine, my torches and hammer coral all stay the same, its just the big meaty LPS...

 

[Lloyd Williams]

Following for my weirdos

 

[Rpc07]

Is there any piece of equipment that goes on around that time that could possibly be causing stray voltage?

 

[PDR]

Are the lights the same color and intensity from 1-7?

 

[Animal Chin]

Nothing turns on in the tank at 7 so I don't think its voltage and yes the lights are the same.