Shrimp are best added after a few months of a cycled, stable tank, not that they can't be kept before that but just know a mature tank will keep the group happier and better fed.
Tiny fish best in my opinion are Dwarf Rasboras, my favorite because of the shape and spunk and color are the Chili Rasbora, Boraras Brigittae - small don't really care at all about eating any shrimp and inhabit the top 1/3 of the tank primarily. Stay under an inch, so you can get quite a few for a nice group. The other dwarf Boraras are nice too
There were a couple times a ling time ago, I was sold and paid higher price and ended up with a cheaper version. This article is helpful to ID Micro Rasboras.
Which boraras do you really have? A pictorial guide to the most common species - Invertebrates by Msjinkzd
Also Dwarf Cories - C. Pymaeus, Habrosus and Hastatus. A mature and stable tank is best for these guys as well. Especially due to the size of the tank, where fluctuations can literally kill off your tank in a day.
As an FYI, keep track of the Mystery Snails if you have those in there, I have had a medium one in one tank and a large in another over the years, die and not known about it, and almost kill the whole tank. Despite those times, even with years of shrimp keeping, once in awhile there is a problem. Life is full of learning and we try to do our best.