external sump

So I want to start a frag tank to grow out some frags and play around with different corals without the burden of them being on an ugly frag rack in my display tank. I currently have a 180 gallon fairly well established tank (minimal coral, but stable for nearly 3 years now and seeing some...

Hey guys, need some advice. I currently have a JBJ 65g rimless with the stock setup with the filter socks and media. I want to add an external sump. I know I need an overflow box and obviously a sump. I have a fluval flex 37 that I can use as the sump. What are some recommendations people have...