I'm of the opinion that once you have aptasia, or Majanos, you always have them. Aptasia-X or Joe's Juice (essentially the same thing) can be an effective control, but it's unlikely to eradicate them. Biological controls can be very helpful, though I've never been fortunate to find a fish that just ate the pests. My all time best pest anemone eater was an Asfur Angel. Unfortunately it also ate Zooanthids. Came to really like the fish, so that as OK, but still unfortunate.