If you don't know what they species they are then it's unlikely they'll successfully breed as you may well not be meeting their overall needs!

If they're a shoaling species of fish being kept in only a trio they will chase and bully one another, it won't be spawning activity. Shoaling species must be in groups of 6 or more and may well need a tank a lot larger than a 10g.

ID your fish, that's the only way you will be able to work out if they could breed for you.

EDIT: There's no such thing as "striped tetra". Common names don't really mean anything. If you post up a pick we can ID them properly. It could be Tetra, Rasbora or Danio, most likely Tetra or Rasbora. These are all shoaling fish and most can't be kept in a 10g. They need fairly specific conditions in order to breed.

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