Some stores will sell comets at about 5-6 inches. A garden store would be your best bet to find them at that size and for a more reasonable price than a petstore.
I fed my goldfish tiny pieces of carrot, peas, blanched lettuce (romaine), cucumber, zucchini, small pieces of shrimp.. And I think that's about it. Just be careful, just because something fits in their mouth, doesn't mean that they can actually swallow it. I had to save a comet from himself. lol
And rinse, rinse, rinse your sand. if there's ANY silt left, it'll get into your filter as the fish stirs it up, and it will mess with your mechanical pieces to your filters.
Last edited by Skyewillow; 06-09-2013 at 03:21 PM.