Winter in Virginia is coming quickly and I am trying to design an aquaponic filter system for a 10' x 3' tank housed in unheated/uninsulated fish shed. The goal is to create a mechanism that serves as a biofilter AND a cleaning filter while insulating the water input and output conduits thus preventing a freeze up. I have an idea for using Styrofoam layers and a submersible sump-pump; however, if anyone knows of a ready-made system, it may be worth my time and money to purchase that instead of starting another project. Thoughts?