Wall/closet instillation

[TinyTemper]

I should have posted this here in the first place.

So I have a closet that spans the length of my dining room. Roughly 9 feet long and 2 feet deep i want to put a 75 gal aquarium in the closet and cut out a hole in the wall for where we will have it out for viewing it will be resting on a stand not the wall. The aquarium will go pretty much where that painting is. The duct work is comming through the attic not the wall. These are my questions:

1. will the weight of the aquarium, stand, sump pump be to heavy in my peir and beam home.

2. Will I need to get some air flow going though there because of the humidy that may be caused from the aquarium.

3. Are there any issues that I need to think of other than those 2 questions.

4 I think I'm gonna have to build a stand for this and assemble it behind the wall. Is this a good or bad idea.

Thanks for all your help