An update:
Week before last, after more extensive research than before, I decided to get another anemone and hold off on another fish. After my bubble died, which in fact I think I bought a sick/dying one already, I decided to get a hardier anemone. I picked a little white, purple tipped sebae. Unlike my first anem, this one found a foothold in my cave
Well, that caused Goby and Firefish to not be able to hang out in their favorite place. I feed the anem for a few days and then moved him to the front in a nice piece of hollow live rock. Now he resides there!
I have had him for nearly 2 weeks now and he is doing great. Yesterday, he shrunk to almost nothing and I thought he was dying but he was still eating so I believe he was exchanging the water in his body. Sure enough he is back to normal right now.
I do weekly water changes because I don't have purigen yet. The refugium is still going good and nothing has died.