how to breed neon tetra

Well first step you need a second tank handy.

Then you need to identify a male and female and isolate them. Condition them.
 
I've never done it, but I checked an old book for you and it says they require a GH of 5 and a temperature of 70. Only put 1 male and 1 female in it, they need a tank with dim lights and water sprite.
 
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okay thanks for the info. I will have to get another 10 gallon breeding tank. on my last one the sealant broke
 
Get some aquarium sealant and you can reseal it yourself. The Ohio Fish Rescue posted a how to video on this some time ago:
 
AquariaCentral.com