Question for you guys on this now. So if I take this drain and run it straight across to front of stand to a tee going forwards and to the right. Front thinking put true union ball valve so could tie in and still use drain/water change. From the right tee down into a gate valve into an external pump. From pump into the UV and out UV to back of stand to an over the top return.
The drain right now it 1" pvc. So I would use 1" into pump. After pump would need to go from 1" to 2" for UV inlet. Out UV 2" into 3/4".