2.5 gallon is about 12" long, 6" wide and 8" inches deep. (You have probably seen them with 2 dividers and 3 bettas in them)
Is it glass? Man I'd like that in my office if it was glass. Have some green spot algae that just won't come off with a sponge(need a razor). It is a bit thin in width, these Nat Geo 1g are 6"L x 6"W x 8"H so your's is pretty much two of these side by side. Now I really want a new tank for the shrimp, cuz your tank sounds like fun, tho still growing space problems like that Nat Geo 1g.
Go shrimp and forget the fish. There are 2"D x 2"H sponge filters that should be plenty for shrimp bio load.
I'm actually planning an upgrade replacement for my 1g. Something a bit more square tho, like a 25C(10" cube). Moss, anubias petite, attached to PVC tubes or cholla wood. Floating dwarf water lettuce/salvinia minima/red root floaters. I want no rooting plants so that I can move them when I need to catch or clean cuz I don't want it to be a big hassle in the office while coworkers are around.
The thing I liked about the Nat Geo was that water changes are easy with the collection bucket built into it. With control over the rate of drip, I can set it and come in to work in the morning and just empty the bin and refill the reservoir in the cabinet. This also keeps the tank topped off. Less hassle in the office.
With a real aquarium, water changes get more intrusive, will have to have a bucket and siphon tube, refilling becomes an actual chore, as well as topping off. There's clean minimalist aquarium, but also the surrounding maintenance needs to be minimal in the office(gotta get to work!).