One thing I would suggest until you get the opportunity to do your DIY hood with 70W MH, is that you look at aquarium bulbs for your current setup.
Here's a link to what I mean.
http://www.bigalsonline.ca/BigAlsCA/...5050lamp10watt
Most stores carry these in either 10W or 20W and they will make your corals much happier and "pop" better. 6700k will mostly just help the algae take over.