Tricky if you are needing the apex to shut them off if the temp gets high, but MH ballasts are best left to light timers and skip the electronics. Also, turn the fan on as soon as the lights come on, if you are not already - waiting until the temp climbs already puts you WAY behind and you can sometimes never catch up.
Vornado fans is what I use blowing across the top - 5 MH over my 7 foot 240 and this thing on the lowest speed keep the tank from rising even .1 degrees. Computer and DC fans are a joke, IMO.
I have a lot of used, but still working bulbs. Hollar and I can put a few of them in a box and ship them to you.