yes scoop out any old food.

If you get a fish you must always remeber that any food left after half an hour is useless, it looses all minerals and vitamins. So just scoop it out and feed him at a certin time once a day, I feed my fish befor I goto bed at night. So they look forward to it all day .. Also bettas dont eat much so dont fret if all the food isnt gone. Just scoop out old food after half an hour k !! good luck with your new friend!!