I have had one for about 6 to 8 months and it's doing great. When I got it it was white and about the size of a half dollar, now it's about 6 inches or more across. When I first got it I set him in the sand bed but he never moved, planted his foot or ate, and my sebae clown would uproot him by hosting it so hard. But after some advise from PerfectDark I build a little ledge higher in the tank from live rock to get it closer to the lights and within about 2 days it planted it foot, turned a darker color and started growing. My clown feeds him, but I also give him a little piece of shrimp once every 1-2 weeks and it only takes a couple of seconds for him to get it to his mouth. I have only had the one sebae anemone, but from my experience I would say that they are not at all hard to keep if you have decent lighting.