jbanks - yes, all are mp40ws (you'll see a couple tunze nanostreams, as one was being serviced at the time the pics were taken). MP20s seem like kinda a waste...like a golf cart with governer on them...if you could work MP10s, then that would be cool. My glass is 1/2" so they aren't compatible...but I've heard rumors if you put a little super glue on the dry side, they'll work on 1/2" glass. I'm tempted to try it out....
blueface - my tank is actually 36" wide. I think you'll be fine with either 80w or 54w bulbs, just think about your coral placement and what makes sense based on that. Either will provide enough PAR so I wouldn't let that be the deciding factor. If you don't need a ton of light at the edges of your tank, 4' fixture can actually be a lot better as it provides easier access to the tank and saves energy and $$. Also, I would strongly recommend going with ATI over Sfiligoi. Sfiligoi is much more expensive, and their customer service is slow and not good IME. I have to imagine it has improved some with the new distributor, but you still have to deal with the Italian way of doing business (i.e. slowly). I still have a jerry rigged fan up, because my fan bank broke and I haven't been sent a replacement.
