Ijust got my 1st fuge going on my new 180. I stuffed it in the stand while I had the tank off. It is approx. 75 gallons total with 40 gallons of it being a fuge. I have a mag 24 for the return which has a strong flow but mostly over the top of the fuge. Ther is little current at the bottom.It's 48" long, 20" high, and 18" deep. I have approx 12 pounds LR rubble in the 1st baffle after the drain section. I have a little rubble in the fuge and will put more in there as soon as 1 of my LFS's has some. I have 2 4200K 30 flourecents on top of it as of now. I am changing 1 of those to a 6700K as soon as it's in. I have 2 kinds of macro's as of now. 1 is chateo and the other I'm not sure of.Now to the?'s, do I need to put 2 6700's in and lose the 4200, do I need a powerhead for more circulation at the bottom, and is it safe to have 2 macros together at the same time? And can someone identify the other?Thanks!!!