Good trap. There are a few things to consider. The image on the packaging is used for all 3 sizes. So don't judge the size by the picture. Second, more than 2 inches in length is only used as a space for the suction cup. So the box is smaller than you might think just by looking at the metrics. Medium is the smallest size you can use for fish other than the small guppy. After all, it's only held to the tank by suction cups. Works well but over time they wear out and need to be replaced. Overall it's good and will do what it's supposed to do.
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