The rock I bought on my own from two different LFS, so I'm not too far entangled in her previous issues. I'm worried that I'll end up uncovering something potentially dangerous if I end up moving the rock around...I'd just rest easier if I know what everything in my tank has been through. And if I give the rock a few weeks in the tank without inhabitants I think that'll seed the sand bed sufficiently that I won't have a dangerous cycle when the fish go back.
I think that I'll forego adding the chambers to my tank, and maybe do something similar with the next one. Though perhaps I'll throw the rock and inverts into a rubbermaid for a few days so I can paint the back...how long does Krylon Fusion take to dry? That's the best bet with an acrylic tank, right?
And for adding Chaeto to the tank...I could make a small "cage" for it out of egg crate...paint it black, and put it in the corner behind one of my rocks. Would make it easy to keep it under control.
Now that I'm actually going to have time to work on stuff I'm really excited...I think given some time, a bit of money (it'll be nice to have my summer income flowing again), and plenty of luck, this little tank will be real nice in no time.