It's great that you got the water tested - did they give any indication what the readings were? A 10% PWC is a good start, I'd be looking at at least 10-20% water change per week just to keep things running nicely. A liquid test kit, whilst a $30 or so investment at the outset, is a great tool to have so that you can start to monitor and keep track of the water yourself.
As for the behavior, I don't know. Is there any sign of aggression from the male if you have two females in there? How big of a tank is it?