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After many years of doing maintenance I have compiled a list of corals that you shouldn't introduce to your tank because of their smothering ability or ability to kill other corals. 1) Briareum. MS was the first to have this coral back in the day and it sold like hotcakes. Everyone had to have it. When it established itself, it tended to grow across everything in its' way including GSP. Only way to remove it is to scrub it from the rock. 2)Sympodium. Little blue polyps that look amazing and they're blue to boot. Grows fast and reproduces sexually or by stolons and runners. You can have a blue carpet tank if you're not careful. Scrub to remove. 3)Anthelia. Comes in many colors. Liams Cloves are another type that is prettier but has same growth habits of Pink Anthelia. Stolons and runners and not much that it won't grow over. Kills GSP, pocillopora, acros. 4)Borneman Anemones. One member made a fortune selling these because everyone had to have one. Turns out they act as if they are giant aiptasia and sting everything. Grows and reproduces faster than you can remove them. 5)Green Yuma mushrooms. The Yuma craze captured everyone a few years back and the green ones were pretty popular. Unfortunately they sting anything that comes close and if enough of them grow in a tank, they poison the water against new growth of new corals. 6)Kenya Tree. Often sold as a beginner coral. Easily grows in any toilet and drops numeous pieces of itself that lodge in rocks and crevices making it hard to remove. Reproduces quickly. 7)Galaxea. Gonna be on the ban list soon. Has incredibly far reaching sweeper tentacles that burn any tissue upon touch. Encrusts well and sometimes comes in rainbow coloration but the damage it causes far outweighs the color bonus. 8)Green Star Polyps. GSP has qualities similar to Briareum but tends to be more easily controlled. 9)Xenia. Has similar qualities of Anthelia but tends to require cleaner water and is more sensitive to water chemistry fluctuations. Can overrun a tank. 10)Palythoas. 90% of the palys are problematic in that they grow too fast for the home aquarium. Poisonous to boot. Many change from beautiful specimens to Outlaw Stew Palys if lighting conditions fluctuate. Grows over everything including GSP. Nuke Greens, Purple Deaths, Grandis aren't usually a problem.
