I made my first one, and my second one not sure yet as I still have to pick it up.

They are relatively easy and fun to either make or maintain. The very basic design would probably be water in, sent through baffeling to reduce bubbles, then the fuge itself, with the third compartment as a return.

I was having problems with my chaeto in the fuge. I started with culerpra, a small handful from AD, which grew to a huge mass of green stuff. Then I got a handful from Mr. Cob and it started to grow as well. I then thinned out the culpra to the point where all I have is the chaeto. That's when I started noticing the chaeto was getting fragile. It would flake of pieces and there was a large section that seemed to be getting 'old', or at least not healthy.

I placed the wad of chaeto into the second baffle, and moved my HD light to cover down on its new location. About a week, maybe two, later I had to tear the mass in half and place the other half into the intake portion of the baffle.

I rotate the mass about every other day or so, and anticipate that within another week or two I will have to reduce the mount of chaeto that I have.

It's really need watching this stuff grow and all the bugs and fish that live inside the mass of green stuff.