Quote from jackophantIt's a nice effect, but probably not the right setting. In my experience aquariums are usually very dark to have the best visibility inside the tank, similar to your aquarium mid to B connector, but very dark painted walls (obviously not the best for readability in a cs map). The effect you've created would look great in a jungle biome theme, like Kew Gardens or the Eden Project.
Dammit... now I want to make a map like this :
This part is set in a jungle setting containing freshwater fish, so it would make sense to have natural light inside (imo).