Hey guys,
I bet you appreciated the long wait.

Fish number two came yesterday, it seems to be doing well. Unfortunately, I discovered yesterday evening that fish number one (larger and established) can just barely squeeze his fat little belly through the egg crate divider.
However, aggression doesn't seem too bad, and there are lots of hiding places for the smaller fish, so I don't think I'll have to banish either one to the confines of the twenty gallon.
The divider is in now, hopefully within a few days the first fish won't be able to fit through and I'll have sort of an "incomplete divider", where the smaller fish can swim throughout the whole tank, and the bigger fish only gets half.
I've been doing five gallon water changes daily (35 gallons per week), and I got some algae discs (only think I could find with spirulina) that they like to nibble on.
The computer doesn't want to let me upload any pics for some reason, but I've got three tank pics (without divider), and three crappy pics of the new fish, maybe they'll upload tomorrow.