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hrmm, i dont think the "lasers" would actually be able to blind them. if they were to use a real laser for the game, it would be way too hard to hit each other because the beam is only like a few mm wide. i think they are using ir for the beam, so it wont even effect the fish
Don't forget, a good way to catch a zebra danio is by leaving their tank covered by an opaque cloth, than removing it suddenly.