ok so I have always had either Koralia or a Vortech in my tank..This tank I was rocking 1 Koralia evo 750 and 2 Koralia nano 425gph pumps..the flow was ok..So i decided to finally try a Tunze..I got 1 6015 at first to try it out..I removed the Koralia 750gph pump and replaced it with this..Let me tell you even though this Tunze says 470gph this pushes WAY more water around then that Koralia 750 could..and it makes those nano 425gph seem like they do NOTHING at all..so i ordered a 2nd one and replced those 2 nano pumps and it gives me real nice flow all around the tank..Plus they are nicer looking and the 3D position ability of these pumps are great for fine tuning the flow direction.