I am thinking of getting one Koralia pump. I have a Tunze pump on one side of my 55 gallon (model 7310/2 - has the controller so the flow is varied during the day). I think the wide flow of the koralia coming from the opposite side would really help, especially since the tunze is not a wide flow. Being that I only have a 55 gallon, I would like opinions as to whether you think I should get the #2 or #3 Koralia (600gph vs 850gph). When it comes to corals, all I only have some softies and lps, no SPS.