Radio shack sells the connectors that came with the Tunze kits. The come in a series of I think 8 connections and you just snap off 2 for use on the pump.
They are low voltage pumps so the way you did it will be okay. Better if you soldered/heat shrinked them for corrosion free connection. Tunze just uses the little screw connections and thats it and they do get corrosion over time
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-Mike
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