To answer your question turn them on right after your halides go off. My lights are automated... I have mine on a timer to go on with my sump light. On 11:00pm off at 11:00am then my actinics go on from 11:00AM- Off at 3:00PM Then the MH go on from 2:30pm - 10:30Pm while the actinics go back on at 6:00pm-11:00pm and thus repeating the cycle.
Not at all, I do however have to clean my DT front glass every 4 -5 days when I notice spots. I believe this is normal practice with MH though. My lights are hanging and are 6" from the top of the water surface. Didn't mean to hijack.....wow that's a high amount(quantity-time) of light.....9 hrs. of actinics, 8 hrs. of mh.......do you have any algae problems?