Two words for you: Lump head (Steatocranus Casuarius), link to video:
http://www.youtube.com/watch?v=UtWDDFIrgwM&feature=related
I've only heard good things about the Berlin aquarium and have visiting it on my bucket list. I've kept, bred, raised and sold many Congo River, Amazon River and other Cichlids (fresh-water fish). I enjoy seeing this hobby on a professional scale. When I was at the San Francisco aquarium I was encouraged by what I saw and want for more.
I wish I was in Berlin now so that I wouldn't have to gather up all of the wet leaves in my yard. Unfortunately, I'm stuck in Oregon's Willamette Valley (like living in a wet tissue), as usual. When I get there I will knock on your door and buy you a beer and bring you a Buck knife you don't already have.