I want to buy a pre-built refugium or build one myself. Where did you get yours? Any good sites for how to build one? Thoughts of glass aquarium vs acrylic? I want to use a skimmer, then miracle mud, then bio-balls, and finally the return sump. I have a 90 gallon tank, how large of a sump? Do I need to route some of the flow around the refugium? Thanks for your input!