Well... I've been shoot down
JK. I kept a scooter for 2 yrs in a 29. It will eat other things including flatworms and brine, at least mine did.
The decision is obiously yours, you know your tank and what it could handle.
(look into my eyes... 8O ...You are getting sleepy...When I snap my fingers, you will go buy a scooter blenny! SNAP!)