I'm one of those on the other side of the fence. I wouldn't put them in my tank to be a cleaner. IMO, you'll need many to have any effect so they are just adding to the bioload. Most are meant to be in coldwater. I know there are warmer water species out there, but most of what are being sold as cleaner clams are coldwater. Because they can survive in warmer water, doesn't mean they are suppose to be there.