Well, with Octavian gone I took out a divider and decided to do over the tank in a way that I've been wanting to do for a while now!
I'd bought one of those fake rock shelves when I went to Petco, and I got some real plants too. It was a bit of a pain to install and make sure everything fit properly in my tank though.
So now Calix has around 7 gallons to himself and Atlas has 3!
Calix loves the camboba. He's always chilling in it. And Atlas' favourite place is behind the driftwood. They both really seem to like their renovated tank.