900 watts of heat

and the water temp is still 74.... i know that my wtaer temp is fine under normal conditions but it should be between 80-84 so my fish will breed any suggestions besides adding more heaters.... does or is there a inline heater i can hook up too my return line from the sump

They do make inline heaters.

now is it more cost effecient then running all seperate heaters or is it about the same cuz i believe i need about 1000 watts and teh temp will be fine

That I'm not sure on......

What is the air temp around the tank?.......You may have to make an insulating shell around your tank like I have done.....My tanks are in an unheated two car garage.