Ya, the thought of having filter socks without the work of having filter socks is quite inviting. I'm excited about getting it up and going. I want to do it right though. I'd like to get things set so that all water passes through the roller mat before moving on to the skimmer or other filtration. I use a Rubbermaid for a sump. Lots of room, but not very segregation-friendly. I've been thinking of a way to add a "pre-sump" so to speak. I have a few ideas, but wish I could find a material that I could use to work out all the potential issues before I commit to building the final design in what will probably be acrylic. And with little to no acrylic experience, I'll probably need twice the amount that should be needed to make up for my mistakes. Not looking like it'll be an inexpensive project. I've looked at possibly using PVC sheets, but it doesn't seem to be much cheaper. Haven't been able to come across any other material at a reasonable price. If someone has an idea of another material that would work, I'd love to hear it.