I have been using Sodium Hydroxide to carpet bomb my rock work to get rid of my Mojano problem that I allowed to get totally out of control. It has worked like a dream. I really did not have to be careful about damaging corals as those got wiped out a while back due to other circumstances. With the amount that I used in one treatment it cranked the Ph up quite a bit, nothing that Is really of any concern. My skimmer went totally crazy so I kept it off for a day or two but otherwise result has been amazing. Thanks Jake.