Wow thank you for the pictures.

That looks like a custom canopy that you made for the tank. Can you share more info on it? 760 watts generates a lot of heat so are you directing the hot air out? Do the fans within the fixture work normally as intended within that canopy?

I can't really from that one image of the T5 lights, but are the reflectors just one U shape around both T5HO bulbs? Based on your pictures, it doesn't look like they are supplement any actinic. But then it also doesn't look like you have them turned on.