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How to breed neon tetras
Set up a breeding tank.
You will need more than one tank in order to breed tetras, so get another one if you do not have one already. You can use a 12 x 8 x 8 inch (30 x 20 x 20 cm) tank to breed your tetras.
You will use this tank to bring a male and female tetra together for breeding and also as a place incubate the eggs and baby tetras. You can set this tank up similar to how you have your normal tank set up.