You could do a shrimp palu in the hex. Heck, they can go months just feeding on the natural biofilm in the tank. Perfect for a busy guy like you.
Bad news, the bowfront has to wait. I have to tear this sucker apart completely to make some repairs. The land section on the left is lifting. A few repairs failed. I figure that since i need to tear it apart, i might as well do a re-design. I love this tank, but i still think i can do so much more with the space i have.