Weird Observation!! Please advise

[OCDP]

Okay so I posted a while back regarding my pulsing xenia not pulsing.

Well.. the past week and a half or so (ish) I have noticed this... in the morning in particular , when my lights are off, (haven't checked this at night because I usually hit the sack soon after lights out) .. but in the morning my pulsing xenia pulses sooo nicely... it looks awesome.. but it seems during the day say when I get home from work, they are just open but not pulsing...

Now I am guessing this could be a pH issue? or something chemistry related (blaahh) .. just thought it was a weird, yet cool observation... also, just to note. I turn my Seio 620 off at night, but the placement of my xenia is pretty low flow ...

Any input would be great.. thanks