I'm actually plumbing my new tank tonight:mrgreen: Im using 1" for the overflows, which IMO is good enough as there are two, and 5/8 for the return. I find there's a huge difference in the flow between 1/2" and 5/8.. So I go 5/8".

I don't use overflows. I have elbows with strainers.. It's always worked for me.

Do a small center internal overflow box just big enough for 1 -1 1/2" bulkhead for the main drain, choaked back with a gate valve and 1 - 1" bulkhead for an emergency drain, as so known as a Herbie.

That is my suggestion for what it worth.

Pretty good plan, not too much real estate taken up. You should come over and see mine, and get some PVC (pleeeeese :))

Put it all in a box and send it to me collect:twised:

OR do a small corner box with a Durso, then there is no need for a gat valve. Bring your return up through the other corner with a check valve and some loc- line at the bottom of the tank.

Im gonna be drilling the back of the tank, the bottom is tempered.

Well it looks like I have allot more planning to do! There is way more options than I thought!

I had a 155gal bow front that was drilled in the back. The overflow were only 6" x 6" so I took a 90 degree elbow and cut it as shrt as possible on one end then made a took a very short piece of 1 1/2" PVC pipe glued it into the elbow and shoved it into the bulkhead but did not glue it. The top end was a Hofer Gurgle Buster. It was compact, easy to build and adjustable.

Just another idea to add to the rest:twised: