very cool but it raises the question - why is there not (or is there?) an acrylic tank with an anti-scratch coating (one that actually works) on the inside and outside of the tank? If this is out there I would love to know. The coating would obviously need to be transparent and tough enough not to scratch as well as stand up to frequent cleaning (be able to take at least a 3M scuff pad)
Speaking of 3M...they make clear film that is cut to shape for acrylic headlight protection...I wonder if you could get large sheets to at least cover the outside of an acrylic tank. I'll have to ask my source about how much and how big...hmmm. If it will protect headlights from roadgrime and rocks..it is also a UV protectant to prevent yellowing and hazing.
You could also check for autobody shops that do the "clear bra" for cars...same type of thing...although I don't know if that is spray or sticker.