Newsman is no mathematician

I'm trying to figure out if I have enough flow in my tank with my current setup. I apologize if important information to help with the formula is missing. Here's what I know:

72 gallon tank
Mag 18 pump in sump using wet/dry filtration
3 feet of 3/4" hose to outside chemical filtration (phosphate) from there it's to another chemical filtration container (carbon) connected with 6" of tubing...
From there it's 2 feet of tubing to the intake on the 1/4 hp oceanic chiller... from there... it's 3 feet to the tank with built in overflow box

I also have a 4 mj1200 pumps in the tank connected to a wavemaker.

Is the mag 18 enough for my tank??
A mag 10 was terrible with return flow ...
I wanted to see if I should upgrade or stay.

Thanks for your help!
Ryan

 

If what is in your sig is current, that sounds great!

 

Are you running the full flow through all those things you mentioned or do you have a line split off to feed the reactors and such?

A Mag 18 is a very big pump, much bigger than you need for a return on a 72 gallon display and way too much velocity for a sump or wet dry to function effectively. A phosphate reactor needs maybe 60-80 GPH so you don't pulverize the media.
You are probably on the high side for good cooling with the chiller too.
The biggest problem is using 3/4" return hose with a pump that large, you are adding tremendous head or backpressure since it should have a 1" or better yet 1.25" return line for best efficiency.

My display is a 100G and my sump is a 30G long. The return pump is a Ocean Runner 3500 (equal to a Mag 9.5) plumbed with 3/4" and my flows have to be throttled back slightly to keep it in the 700-800 GPH range.

Maybe you need to descibe your setup a little better including how everything is plumbed, as in flow thru or a branch leading off to it etc., valves, sizes and such. I don't see the need for such a large, powerhog pump for a return, you would do better with a smaller, much more efficient pump that produces much less excess heat too.