Both the square and round feeding rings are of high quality, they are very strong yet have a modern, elegant look. The suction cup mounting bar is made of nice plastic and has strong attachments to the suction cup and ring, but to do this you must attach the suction cup at right angles to the water surface or the ring will not float smoothly. These are exactly the ones I wanted for my betta aquarium that will house my growing population of water elves, they are also great for training/feeding.
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