I might as well post some q's while I'm here. I am setting up a 26gal cube SPS and dunno what to do for flow. I will be running a Mag7 return from the sump into an Oceansmotions Squirt. The tank has a 4"x4" overflow in the center of the rear and is drilled with a return on each side of the overflow on the back glass about an 1 1/2 from the top. I don't think the Mag7 will be enough...even with the O/M Squirt cycling between the two returns. I have just read the posts about Tunze's new nanostream. Would this be a better option rather than a closedloop. (this is in addition to the return)How many would be required. Whatever is installed needs some flow variation so some type of controller or another O/M Squirt would be considered. Space is a concern. I can control the heat from multiple pumps with a chiller. Please, Please, Please give me your input. Thanks.