I have a question about what size pvc piping i should use to plumb my pro clear 200 to my tetra 1200 pump. the bulkhead is a 1" in the middle and out side threads are 1 1/4". the pump input is 1" as well. should i use 1" pvc from the bulkhead to the pump or step it up to 1 1/4"? i have both sizes in pipe all i need to get is the fittings and one union. the return line to the tank is 1". will the 1 1/4" pvc do any thing or should it all just be 1" since bulkhead and input on pump is 1"? i hope everyone follows what im asking. thanks