I would like to remove all the GSP in my tank. I bought everything from a reefer getting out of the hobby. None of the live rock had any coral when I set everything up at home. However, some GSP survived. As you can see in the picture it is on the large rock in the middle. This rock is probably 15 - 20 pounds and would be a real pain to take out. I have removed a portion before, but in 4 weeks it grew back. I've read that I can spread kalkwasser paste on the area and that should kill everything. First, will this work? Secondly, what effect will this have on my tanks parameters (alk, calcium, etc)?