Do you have any earthquakes there? Masonry is very rigid, unable to flex with earth movements. I think glass bonded to masonry would tend to crack with even minor earth movement. Then, there is the thermal expansion to think about. The water in the tank would tend to hold everything at a stable temperature, but I don't know off hand whether the coefficient of thermal expansion for glass and bricks would be enough different to lead to problems. Glass bends when you apply stress to it, so if the support behind that thin glass, by the bricks, isn't even, you could cause a stress concentration that might lead to cracks. But, using a thick enough layer of silicone adhesive might solve all of the above potential problems.
Please, take lots of photos and share them with us. This is a very interesting idea.