They are huge. I decided to rewrite my review after doing some research and using these cups as feeders. For the most part they do what they say. The piece left at the bottom cannot be removed by the fish, but it keeps them from being so greedy and wasting everything in my tank. Smaller fish cannot use it but seem to enjoy "swimmers" that are too small to be kept in small holes. All in all for the price I still say they are a good deal. I have found that they are not very good for plant life and will not stick to an underwater tank. The top attachment allows the bottom of the feeder to be kept submerged. I still find them huge compared to bottom bait but I'm glad I have space to keep my frozen fish in my larger tanks. Many Thanks.
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