I have a 55g fish only tank with a rio 1700 pump which has a flow rate of 642. Being new to setting up a tank, I was not thinking that the length of the return hose going from the sump back to the tank would effect the water turnover rate. If I need a min of 6' of return hose, should I have a stronger pump? At 6' Rio says the flow rate is only 180gph.