Oh yeah, that's nothing special, I learned how to do it on Nano-Reef's DIY Forums. It's actually the smallest Aquaclear Filter. The Aquaclear 20, and I just to the basket apart and used silicone to attach the grated looking part to act as a barrier so only the water can get out. I added some the substrate from the aquarium, chaeto, and a submersible light.also im interested in the hob thing you have modified.