Im looking at all of that water movement...couldn't that be extreemly hard on the structure of that tank? I've never had one and I don't want to do that math so I am clueless at best on this.
No, because the force is spread out over the entire surface area of the glass. Glass is extremely good at holding back uniform diffuse force, hence it makes an excellent material to build our tanks out of. Glass is not very effective at resisting point forces, shock, or impulses, but moving water like a wavebox produces none of those types of energy/force