Here is what I used for mine. Used Ebay foam sheets cost 7$ shipped, used PVC for my uplift tube and pieces from my old double sponge filters. Have around 8.50$ per tank. I've had some for 3-4 years and has been fine. Even if it breaks down at this point I'd say I'm good. Swiss tropicals charges 20$+ for a 10g tank plus a minimum of 13$ shipping. I tried to buy 1 small uplift tube to try and shipping was more than the cost of the pipe. I asked about it and they replied saying their margins were too low to not charge high shipping to make up costs. Doesn't seem right to me but that's how they do business. Just sharing the route I went, there's many ways to do these. Highly recommend them just for the surface area of bio filters. Do what works best for you. https://vimeo.com/196992473 Video attached to show how much flow my DIY gets. Works perfect and a ton of water movement.