Hellow everyone. Im new to the hobby but im excited about things to come. I bought a 125 gallon tank from a good fella and member in the S.D. area. Just finished the building of my stand and now starting to buff out the aquarium. I do have one question. The tank has 3 bulkheads in the back wall of the tank, should i set up 1 inlet and 2 returns or drill a 4th hole for 2 and 2. Still unsure if i want to do a reef or something else.