Ok, that's what I thought. So if I get the other pump I'll just try it on the res/recirc. What did you look for as far as adjusting the flow? How did you know when you had it regulated right? It's hard for me to do coloring right now because well...I can't. Like I said my res. is about 3 1/2ft from first module and only have a total of six? So I should be able to get the one right below your model, just a little less watts and lpm's? What do you think?