Howdy, I am confirming sizes of PVC plumbing for my deep blue 34 gallon frag tank. The overflow that came with the tank was 1 1/2 inches as seen in the picture below and the return is 1 inch. I want to replace the plumbing for a fresh start with the tank to ensure nothing becomes an issue. Plus I don't really want to use flex hose so it's getting hard plumbed. My question is can I do both the overflow and return at 1 inch? Are there any downfalls to this? The overflow gets reduced to what appears to be 1 inch going into the bulkhead. I read that the durso should be larger and than reduced as it pulls a lot of water. Is that totally necessary? Furthermore do people typically do slip x threaded bulkheads?