Just removed a frag of nuclear green palys after finding out how toxic and invasive they were. One was stuck to the rock pretty good so I pulled on it and it excreted brown juice which I believe to be the toxins. I took out all that I could in the water but that process stressed me the f out. There was still some free floaters so I added some chemipure blue carbon to remove whatever was left. Question is how long will that stuff last in there? Also if these somehow pop up again in The tank what’s the procedure to get rid of them. Tanks is a 13.5 for reference.