I can honestly say I think the betta, cherry barbs, and possibly the rasboro will hunt and eat the shrimp. I'm speaking from past experience, this is why I have decided to keep this as a shrimp only tank. i also use seachem products, but they are 100% safe for freshwater invertebrates if used properly when dosing. I hope this helps, but feel free to contact me with any other questions.
Huh. Well maybe they're snacking on them then... I might try and get some of the ghost shrimp next time I go to my LFS, some small ones for snacks and big ones to hang around lol... I guess it would be good for the fish? I dunno