I think it would be wise to review everything that Brad has posted and make your decisions from there. He has so many good points.
Let's just say that hypothetically the hospital has all the supplies it requires and the tank could be installed with a reasonable maintenance plan, that still doesn't change the fact that people are at the hospital to get better, for their kids to get better. Nobody in their right mind is going to be staring at a fish tank. Either the patients are in and out, or they're in their room with limited mobility.
I'm sure everyone remembers being in the mall as a kid and wanting to go to a store at the other end, only to have their mom tell them it's too far, or being at the zoo and wanting to see the lions, but it's too late and you have to get going home. A reef tank in a hospital would only cause this same sort of dissention. It will result in parents and nurses having to explain to a sick child that they can't go see the tank, resulting in a sick child getting upset and feeling left out. How horrible would it be to suffer from a serious illness, and feel alienated for other reasons also.
50k can buy a lot of colouring books and video games.
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