I've been following for a while, just thought I'd pop in and say Hello!
We all get the urge to "go bigger" whenever we can, but I think you made the right decision in not doing so. Hang a poster/painting on either side of the tank and see how it looks then. I imagine you will be pleasantly surprised with your framed slice of ocean.

Cheers on the auto top off, I've been meaning to do something like that and had a little :idea: when I saw yours.
Good luck with the bubble algae fight, it is a never-ending battle once you get it. And inevitably, everyone gets it somehow. We just went through a huge outbreak this summer, which is now being slowly curbed with the help of a few emerald crabs and some intermittent siphoning/cleaning. The siphoning is very easy if you have a few key items: large-diameter siphon tube (ours is from a "Python" kit, 2" ID I believe), large-diameter hose (3/4" ID vinyl), and a filter sock. Start a siphon and stick the output of the hose into the filter sock in the sump, you may have to increase your return pump flow, and pick off as much valonia as you can with a screwdriver or toothpick or chopstick. I wouldn't worry about popping them either, since that is how the emeralds eat it. We've done this a couple times with great success, our emeralds are getting large and still only eating valonia, and our hermit crabs are beginning to eat any popped bubbles as well.
BTW, you may want to turn your desk so that it points towards the tank. Otherwise, you'll be seeing the chiropractor every month with this ache in your neck, from turning your head to one side so much!
Cheers,
Marty