I keep considering inverts in the fuge, but haven't jumped the gun on it yet since the nuisance algae that does show up disappears, I am guessing due to the pods.
I have chaeto I puchased specifically for the fuge.
Sea lettuce that popped up in the display put of nowhere that I tore off the rocks and tossed down into the fuge.
A brightwell media brick.
Some rocks, and an absurd amount of pods.
I did a few jars from algae barn initially and they have done well, but one small algae covered rock from the LFS, and a bag of pods from reef cleaners have absolutely bloomed the pods in the fuge.
There are so many different kinds, and millions and millions of them.
Highly recomend the reefcleaners one, they had a bunch of different ones in the bag, and there was some sort of crud in the water that the fuge seemed to love.
Edit: i highly recommend algae barns as well, especially if you want species specific, but for me, the dirty mix of everything is way cooler.