Can they suck in wafers like other fish can, or do they need to scrape them? I know mine can suck in crisps, but how big do they have to be, and if they can just suck up shrimp pellets and algae wafers as a whole?
if something is small enough to fit in their mouths they will suck it in and chew it. larger items have to be scraped.
It matters when the tin foils see it and eyeball the pleco the entire time waiting for that one chance for it to slip!