Have you bought your new shrimps yet?
For your poor purchase experience,
That is the reason why I always check the sellers' rating and feedback first. You may call me biased toward new sellers who have 0 feedback. You can't go wrong with people having rating of something like 590 good out of 594 transactions. Those are the only sellers I buy from.
So, pick your sellers well. 
In any case, if you want the shrimps to breed, you need to have some java moss in the tank whether or not you have fish in it. They love fine leafed plants as hiding places, and it provides them a natural food source on the top of what you give to them.
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