I think any of them are fine.
I bought this on sale from Menards for $39, the shelves are rated 350# each. (evenly distributed)
I have had this set up for over a year.
Now there are 3, 20 gal tanks on it.
Before that I had a 37 gal on the middle shelf, and a 20 above it.
I have had a 37, a 10 ,and a 20 on this shelf...
And havent had any concerns.
It is rated 350# Per shelf.
And it seems to handle it just fine.

I bought this on sale from Menards for $39, the shelves are rated 350# each. (evenly distributed)
I have had this set up for over a year.
Now there are 3, 20 gal tanks on it.
Before that I had a 37 gal on the middle shelf, and a 20 above it.
I have had a 37, a 10 ,and a 20 on this shelf...
And havent had any concerns.
It is rated 350# Per shelf.
And it seems to handle it just fine.
