Well in our 55 gallon tank we thought we had problems with our 3 aiptasia anemones.... Here is a photo of a small selection of aiptasia's at The Deep in Hull
Any volunteers to dive down with some Joe's Juice??!!...
Aiptasia aren't that bad. I have loads in my system, far more than Joes Juice could take care of for less than £50. After a while they look alright
Edit:
See, while the death of an anemone was irksome in that it wiped out almost all life in my SW system, it did turn all the aiptasia a lovely shade of white: