Like I said, I don't have first hand experience with a sump, as I've never had one, yet. Just trying to give what knowledge I've accumulated from reef forums.
I really don't care about the "Texas Trash Palys". If they grow, they grow. Rip some out when there are too many, let them grow back, and then rip some more out. I don't see why these palys are such a fuss.