I dont know I thought the same thing about my 90cm planted tank when I added cherry shirmp to it. I have platies and plecos and gouramies, neon tetra, and the little guys seem to survive and breed well! I have lots of places for them to hide. heres a picture of the tank and it also has one betta fish.
I added ghost shimp to my GF tank [when I had them] and I found later just how far they would go to get out. My ferret found a shimp on the floor and ate the head [eew]. The shrimp were skipping on the surface tying to avoid the GF.