I'm talkin about those things that people have in their tank so all the food stays inside the ring and the fish come eat out of it. So food doesn't get sucked up into the filter and what not. We just made one and it seems to work pretty well if there is any left over waste, (floating waste anyways) but it is kind of an eye sore. Just trying to figure out if anyone uses them. I think I am going to do away with mine. I could see it would be really helpful with a pond though, that you can't really remove extra food easily.


