That's what the article said.
According to the article, Chaeto won't go sexual, but instead "sheds" pieces that will grow in other places that might not be so good, like pumps and return lines. Rotating it will keep it from shedding, evidently.
No advice in the article about how often to do that, though.
I anchored my Chaeto between a couple of live rocks in my mud filter, and I'm gonna let it free to float in the filter instead. I'll update if I get any results one way or the other.