GSP Yuck!
 

When I started I innocently bought a frag of GSP from a hobby auction. Now it's grown 10-20x it's origninal area size and is taking over my tank. Same said for some zoos I bough (easier to get rid of though). I want to get some pretty SPS coral and get rid of the green shag rug monster. I regularly scrape pieces of it away to try and control it's growth, but it keeps up with me. I tried a caustic soda solution and inject it into the GSP and that works very well (same thing as I use for aptasia). I curse on the person who sold me that frag. LOL!