From what I can see:

-Your lights might be too high (though im not sure how hot a 1000W MH gets)
-Little too cold at night, should be above 70*F
-Do you have at least one circulation and one exhaust fan?
-Source water is very basic @ 7.8, but your runoff is 6.3? I'm not sure if thats a problem, it just seems weird.

Those are the only problems I see...