Okay, well, I went with the Hydor SlimSkim, which I was assured would fit in a 29 BC. Sure, if you don't mind giving up about 1/6 of your visible tank space. And no, it doesn't fit in the water return chamber either, if you want any suction from the vents.
Arrgh. So I'm selling that one and trying something else.
I found the Tunze 9002, but not the BC mod cup, which is a necessity since I need the lid (cats). Can anyone point me in the right direction?
Thanks.