I plan on upgrading my tank in the not so distant future. I am wanting to get a 200+ gallon tank. I will probably have a 100 G refugium/sump. What i am wanting is some ideas about plumbing. My tank will be RR. Should i get 3 holes drilled or just 2? The reason I ask is because I recently learned about the benefits of Closed Loop Systems improving flow in tank. If anyone has a good diagram or something of the sort that would help tremendously! I am going to try to post what I have in my tank now so we can try and work off of that base.