Closed loop for my 90 gal

[forsaken541]

Here is a pic of my Calfo Style closed loop that I am planning on for my 90 gal glass. The intake will be from piping over the top of the tank lip and then down to a pump under my tank where it will be returned to the closed loop on top of the tank with 6 outlets with loc line to direct the flow. I am not drawing from my sump because I only have a cpr 100 for an overflow and am happy with my throught he sum flow. I just really want to get rid of my Ph's.

Question 1.- what pump should I use for this?

Question 2.- Is this a good design?