Ok so i have a 29 gallon reef setup right now with 2 425 koralia nanos and my return is rated for 400 gpm i forgot the brand. I am working on upgrading to a 46 gallon bow front and a mag7 return pump. I know i am going to need more flow but im not sure how to achieve the best result with out spending a fortune. I would love to pick up a pair of mp10 but the wife might kill me. shoild i use the 425s and add a big pump or 2 smaller ones. Or should i not use them and get 2 big pums. Any suggestions