good morning Aquarist
I was under the impression that the canopy's had an open top, like a box without a cover, just the four corners. It would sit on the edge of the tank, but you would still have access to your hood, lights etc. It just keeps all those things hidden from sight. Unless your standing on a foot stool or a step ladder.

Im sure there are many styles that differ, but that is what I thought they were pretty much about.
Do you have the glass tank top? I have that on my 125 and love it, so much more than the dark tank cover and bulky hood/lights like my other tanks have.
Congrats on the new tank btw!
