I currently have a HOB CPR Aquafuge. It's the medium size and the older model that uses a siphon for the outlet. Right now it's hanging on my 65g and I'm wondering if it's worth the hassle. I've had a number of issues with it and right now it's covered in algae and cyano. I also have 4" of sand in it. I read on WetWebMedia that it's basically a "puddle" and doesn't serve much of a purpose. Should I remove it? I've also thought about taking it off, cleaning the sand out of it and running it as nothing more that a cheato farm. I want to modify the outlet to the newer style that's gravity fed rather than depending on a siphon. If I can do that my water level issue will be taken care of. I'm just wondering if it's really worth fooling with at all.