What about using a link to your profile to describe the tanks? I thougt that was mentioned in the suggestion. I really don't care to see everyone's description of their tanks in their signature. Please put a link instead of a list. It will clean things up even more.
I have been working on a little website that tells about my aquarium that I will replace EVERYTHING with (Signature, Profile, etc) so all you have to do is go to my website to see the pictures, details, etc etc etc.
I too was a guilty one. Just listing the names of the Africans in the 150 gal tank took up something like 8 lines. It's a good idea to shorten it. I try to not attach the sig unless asking a question. But, good idea.