looking at a wp pump for a 90

I would do 2 40's with the controller. Run them alternating and get great flow that is really turbulent and can go super high if you decide to ever go more sps later.

http://reefbreeders.com/shop/jebao-dual-controller/

 

I feel 2 40s would be way to much for a 90. 2 of the 25s would be perfect and much more discreet in the tank.

 

For what it's worth I have 2 25's running in my 36 inch long 65. Both run on the random mode and it's not too much flow at all. Even have spots for low flow corals. I figure with the extra foot of size (I assume if standard 90) the 25's I have wouldn't really be enough for me personally. Can always turn the 40's down - at least that is my experience with WP's.

 

I really like the WP's I have a 40 and a 25. The WP 40 is hooked up to my Apex and both prove to be great wave makers. I use the 40 to push water across front of tank and the 25 pushes water on back near bottom across the back side of live rock.

 

Both running on my 220 reef system