Awesome suggestions guys! Keep em coming!
I'd love to do a planted saltwater tank, but my 20 gallon reef is verging on one... what with so much macro in it.
I'll talk over the idea of bangaii cardinals with raf, he might just go for it (its going to be in his new place).
We're thinking like 1 "main" fish in the tank or something like that, like a dwarf lionfish (but we are setting up another tank for lions). Having the tank specialized for a particular fish or invert or something like that. We want a mantis too but are thinking of a smaller tank for one... that way if it breaks the glass then its not so much water to clean up :P
So many possibilities!
-Diana