I do. It wasn't intentional, as the Caulerpa hitchhiked with the Chaeto. It's been said that the Caulerpa can go sexual an invade the tank. Hasn't been the case for me yet (been close to 2 years). Any macro that escapes the sump is quickly eaten by the tangs. It seems like the Caulerpa grows faster than the Chaeto, but hasn't choked it out. I pull about a gallon of both out of the fuge about every 3 weeks or so. So far I'm pretty happy.
I do , just started running cheato , its pretty slow compared to the Caulerpa prolifera , i do not use grape or others since they get crazy to control sometimes