I'm a newbie and have a 55 gallon "patch reef", well the beginnings of one. I'm currently using a hob filter, but would like to do a sump with an ATS. I have the flow rates and what I would like to do with the ATS, which wil be a waterfall style. My question is sump design, how do I go about this with the plumbing? Does anybody have a diagram that I could use. I plan on running the ATS off of my overflow, which will be a pvc overflow as my tank is not drilled. I may or may not add a refugium if the design would allow for it. Thanks in advance.