Ok, I moved the chaeto to my other tank's fuge, and ended up having to take some of that out a few days ago b/c it had grown too much.
I've read on here before that chaeto grows inside itself, meaning that it won't expand until it hits a certain density. Then it expands outward at that density.
Could my chaeto basically have expanded to the max size and density, and I just didn't know enough to pull some of it out?