Could you get a couple of pics up of the lighting fittings, it would be intresting to see how you've done things.
Regarding the skimmer, i use the black sponge that came with the skimmer, didnt yours? it has a hole down the middle, and is cylindrical, i block the end of it with more black sponge, this seems to stop most of the bubbles, i have a few, but in can live with that.
I light my tank for 10 hours, 8 should be fine, minimise algae at this point, you may have to increase if you add corals.
Adam