Alrighty so I posted a couple of weeks back in the 'watch this space' thread about a idea I came up with, and how I was getting a 3d printed model prototype made. Today it arrived. Here's a few pics of the design. Note that this design is based around the limitations of my wall reef tank. There's also a couple of minor improvements I've made in the time spent waiting for this to arrive. I'll set it up tonight hopefully, and post some pics in action showing how it works.