Growing thru the front side of the rocks were OK, but some started to grow into back side and crevices of the rocks, which started to worry me. Since my tank is 24" deep, it is not easy to even reach many areas.
I scraped off most of the anthelia/xenia with some left on the easy-to-access area only. It was a labor that took more than an hour. I just ordered chaetomorpha thru ebay today. I will try using this for nutrient export from now on.
Thanks, guys.
James