Closed Loop Or Not??? What Is Your Flow Rate's

[The Grizz]

Well I have a dilemma facing me at the moment. I have been thinking of doing a closed loop on my 165 gal 8' tank. BUT I don't think my coral would like a flow rate of 2500 GPH.

Today I am doing a little experiment with my 155. I have a 1100 GPH return and 4 - 1300 GPH power heads but I noticed that a few a my coral were showing signs of not liking that strong flow. So what I have done is shut off 2 of the power head and moved the other 2 to the bottom back of the tank (opposite corner's) facing each other. So now every thing is full open and looking good.

So what I am asking is, anyone that is running a closed loop what is your flow rate? What size of pump are you using? How do you have it plumbed in?

Pictures would be great to see as well. Thanks to all in advance.