What is this anemone?

Marzec95

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Hello everyone,

First of all, please excuse my English, as I’m not a native speaker.

Recently, I bought some new corals for my nano reef tank. One of these corals came with a strange hitchhiker. Since I placed the coral towards the back of my tank, I initially thought the hitchhiker looked like a Ricordea florida. The only visible features were the small, ball-like structures on top that fluoresced a light blue color under the light, as well as a tiny mouth.

However, yesterday I noticed something unusual—this "Ricordea" had a leg and started moving around the tank. On top of that, there are now two of them! That’s when I realized it must be some sort of anemone. Concerned it might be a Majano anemone, I went to my local fish store and showed the staff some pictures of it. We even saw that their tanks had quite a few of the same anemones.

The staff advised me to get rid of them, contiueing saying that while I could keep them if I liked their appearance, they reproduce quickly, are poisonous, and might sting other livestock in my tank. However, they couldn’t identify exactly what kind of anemone it is.
Now, I’d like to know more about this anemone. What is it? Can it safely coexist in my aquarium, or will it harm the other livestock?
Here’s a description of the anemone:

• Very small, with a maximum size between 1 and 2 centimeters
• Appears brown and slightly transparent on the leg under normal lighting
• Tentacles are small and resemble tiny balls
• Under blue light, its body has a slight pink hue, while the tentacles fluoresce light blue
• It has a small mouth on the top that resembles the mouth of a Zoanthid

For reference, my tank currently contains the following livestock, including no hard/stony corals:

• Babylonia snail
• Monetaria annulus
• Kenya tree coral
• Parazoanthids
• Xenia (blue, umbellata)
• Clavularia viridis

If it isn’t a pest species, it might be compatible with my setup. I’d greatly appreciate your help in identifying this anemone and learning whether it’s safe to keep it in the tank.

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BristleWormHater

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That's a majano. They seem hit or miss, some people like the look and keep them others nuke them like aptasia. They can definitely become a problem and reproduce very fast. I'd keep it, but it's up to you.
 

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