I run 3 vaga on my 180 before for mix reef(mostly sps) tank. IME it's not enough coverage for sps to grow, everything take off after I switch to T5. also keep in mind not a good idea to have the fixture inside the canopy! I've 3 fans on top and 1 on each side of the canopy still heat & moisture issue will damage the drivers.
Thanks guys I appreciate everyone's opinion.
Mo Idol- I actually was thinking of adding some fans to the canopy. I was thinking of adding them to the top and back as it already has openings. Thanks again