Hello everyone in the briny deep ! I was wondering if I could tap into the vast seas of knowledge out there that you possess in the form of a couple of questions. I have a 125 g Oceanic aquarium with overflows that are plumbed through the bottom with 2 bulkheads on either end. I plan to use a 55 g aquarium as a sump/refugium, which I've also aquired recently. Herein lies the rub : the tank that I got is tempered, meaning I cannot drill any holes for my pump. I plan to run a Predator ALS 3 Skimmer with an Iwaki 40RLT external pump powering it. I also purchased a Blueline 40HD for a closed loop system ... which is going to involve drilling one 1.5" outtake and four 1" intakes for the system. I also have 2 maxijet 1200's and two via aqua powerheads to work into this equation, if needed I guess my main questions are: ? : How would you plumb the sump for both the Iwaki/Skimmer open loop and the Blueline closed loop without drilling the tank ? ? : How many baffles should I use and how big should they be, exactly ? ? : How would I contain the chaeto in the refugium so it could never get into my display tank ? Before I get my 'hands wet' I hoped to get the opinions of more experienced sump designers ... especially ones who have dealt with this situation before. (Not being able to drill the sump) My only other option, which would solve this problem pretty readily, is if I found someone who would trade a non-tempered 55 for mine. Please throw me some feedback if you know the answers !