Hello!
welcome to RP.
i'm also a newb, but as far as i know, turbo snails eat the algae that grow on your tank, so i don't see any reason why they won't survive in your FOWLR setup.
Regarding cleaner shrimps, sila ung kulay white/off-white na may 2 red stripes on their back. If im not mistaken, they are called cleaner shrimps because they eat parasites from other fish.
i hope I'm right, hehe.
i hope you can post a photo of your tank!
Happy reefing.