I did the AC110 refugium mod back when I had my 46 gallon. Worked great.
All you have to do is remove all the media baskets and silicone in one acrylic baffle. I also cut down the impellor a little to slow down the flow.
I cut a hole out of the lid and put a little Hagen aquahome light on top (which is really nothing more than a night light). I used a mini-CF bulb from IKEA. The thing grew chaeto like mad. I had to prune it weekly because there isn't a whole bunch of room in there.
I even had enough room on the impellor side of the baffle to jam a small media bag if I wanted to.
I ran it on a reverse light cycle at night so I had to wrap the whole thing in electrical tape. It looked pretty ghetto but worked like a charm.
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