A seconding on the Xenia it seems, good to know. What is nopox and how did it help you? Sounds familiar but I have def never used it, curious about your experience with itAs @VintageReefer said, I purchased used dry “live rock” for a tank and fought turf algae and phosphates for quite some time. I dosed homemade NoPox for an extended time and finally was able to conquer the phosphates. Also if you do choose to get Xenia, it can take over. I would only recommend it if you can isolate an island or grow it on the back wall and keep it separate from the rockwork. However it can migrate.