I thought of doing something like this, but didn't. This isn't a bad attempt, but I think it would have much more impact if the frame and tank were backlit - as it is, it looks like brown goo.
Aha a literal meaning to the challenge :-) Although I personally wouldn't have cropped it like you have. I wouldn't have left the space above the frame, rather I would have tried to put the flag (?) inside the frame and crop the top part out.
Nobody can accuse you of not taking the challenge literally. Made me smile. Photographically, it could use a little work on the focus and lighting, but you get an extra point from me on creativity. :)