Hey everyone, I recently plumbed my frag tank and DT together using one return pump. The return line going to the frag tank is 1/2" and the return going to the DT is 3/8". The frag tank is getting a lot of flow and my DT is not getting much flow now; would changing the DT return line to 1/2" increase flow to it?

I'm also thinking about adding a ball valve on both sides, just want to see if this could be a quick fix before cutting the lines in half.

Thanks in advance!