DIY Sump need some advice

[Akimbo]

I am planning on making a sump and refugium out of a 10 Leader and I am planning on the setup in the picture below. I am going to use a Mag 1.9 return pump which does 190 gph. My question is what size downtake should I be using to balance the flow between my tank and sump. Going to have a 3/8" return line.

http://i1007.photobucket.com/albums/af194/akimbo918/Nano%20Build%20Thread%20Prep/Sump-FugeDesign.jpg

[Mr. Thingdoer]

Your return baffle appears to be too tall to function properly

[Akimbo]

ah, how much shorter should it be than the bubble trap?

[JonnyD91]

In that configuration it should be the same height as the last bubble trap baffle going right to left.

[Akimbo]

So it should be like that? (uploaded new pic to same link)

[uncleof6]

So it should be like that? (uploaded new pic to same link)

Slight flow change:

http://i655.photobucket.com/albums/uu274/uncleof6/Untitled-9.jpg

Jim

[Akimbo]

So...what size downtake do I need to get drilled for that return?

[Akimbo]

Rephrase of previous question:

I am wondering what size downtake hole I should have drilled to maintain a balanced level while using a Mag 1.9 return pump with a 3/8 inch return line.