Ooo... ouch. I have an aquarium that I frequent and while I can't say how Toronto's is, I have given up on film for that venue. The lighting is dim, the glass too thick and usually covered in finger, nose, and god-only-knows prints, and the lighting temperature has no natural film equivalent. You also simply can't push Velvia that much. If I was braver I might try Portra 800 and pray all the light bulbs were lit. A polarizer helps with the glass but also eats light.
For lots of things, film in king, in my world, but this is a digital zone for me. One caveat - B&W film works. Push Tri-X to 1600 or live with Delta 3200's grain, and you can do it.