You are a brave soul — I got some monticaps in the 150gal that I could not kill. Like aiptasias, kenya trees, GSP, and xenias, they are very invasive; however, they do look cool. I like mixing / grafting them together though. I got some red + Beach Bum monticaps currently. However, I lost some purple ones (very cool) since the red ones grew much faster and killed everything in between! lol