Also, if you have a labyrinth fish like a betta or gourami, you need to be by the tank at all times in case it goes into the trap. Labyrinth fish need to be able to breathe air at all times, you can't trap one below the water's surface. Same goes for African dwarf frogs.
Aside from the above cautions, that fish trap works great, on just about anything that fits through the hole. The exception is peacock gudgeons and other fish that hover above the substrate, you have to adjust the angle of the funnel or they'll just hover right back out.
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My current project, a 65 gallon aquarium stocked with vernal pool fauna.