I'm going to differ in opinion with my esteemed colleague AMS. I've kept Actinia equina many times and consider them basically indestructible. If you can keep fish alive, you can keep beadlets alive. Mine have been in room-temperature marine tanks and tropical marine tanks with mantis shrimps (at up to 25C). In the tropical marine tanks they proliferated wildly. Within a few weeks I had dozens of tiny anemones on everything (they're livebearers). Admittedly, they were in a tank that only lasted a year, until the research project was done, but during that time they seemed fine. In room temp tanks they live forever (decades, apparently).
It may matter where they're collected from... mine were from the west coast of Scotland where they water is fairly mild, especially in summer. Specimens collected from really cold places may need careful adaptation. Some scientists actually believe there are multiple species that happen to be identical physically (but different in terms of genetics and physiology). So if you're going to keep them in warm water, try and use specimens from, for example the English Channel and West Coast.
For what it's worth, they're also considered a pest species, and have been recorded all around the world as exotics, including in Australia. Their natural range is very wide, from northern Russia down the west Africa, according to my trusty copy of British Anthozoa, almost to the equator. It is indeed found in estuaries, but I personally wouldn't push that too far. Maybe SG 1.015 long term, ideally more.
I would comment that snakelocks anemones (Anemonia viridis) are MUCH more difficult to keep. For one thing, they're photosynthetic.
Cheers, Neale
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