So the halides went on, ( 3 x 250) over a 120, at 11am. I just checked my pH and was a bit disturbed to find it at 7.9. The AC is on. Just for giggles, I thought I'd open the window next to the tank to see if I've got a CO2 accumilation issue causing a lower pH. Well, 15 minutes later, my tanks pH was 8.5... Crazy!