A desperate time calls for desperate measures

[whatcaneyedo]

Seriously? You'd rather treat your tank with chemicals and risk a complete system crash than take out one rock at a time and sit it in the dark for a few weeks? Did you not look at my picture? I know full well what anthelia is and my method worked extremely well to eradicate it from my system. Here are some more pictures to show how infested my tank was. Anthelia is photosynthetic so leaving it in the dark slowly kills it. After a few weeks it won't be dead yet but it will have shrunk and its hold on your rocks will have weakened. At that point you'll be able to easily peel it off without leaving any pieces behind. If you have a dark unlit sump you could rotate rocks through there or you could do what I did and set up a plastic bin full of aquarium water with a heater and powerhead. Its simple, safe and inexpensive.

Have you thought about what is going to happen if you kill it all off at the same time while its still in your tank? A large amount of organic life suddenly dying will pollute your closed system very quickly. You'll need to do some massive water changes, skim and run carbon if you don't want it to crash the entire tank.