Clear small shrimp about 1-1 1/2" long, with black verticle banding? Sounds like korean bumble bee shrimp, If so they are very hardy and can survive freezing winter temps to low 80s, pollution tolerant, sometimes they show up on imported plants and when tiny you just don't see them. I'll look for a picture.
I'm back, found a picture but no genus/species, they called it a Chinese tiger shrimp and it might be a different species than I caught. They don't need brackish water to breed and go directly from eggs to minature adults with no larval stage and get to 3.5 cm long.