The Curlique sea anemone, Bartholomea annulata, also called, corkscrew anemone, or curly cue anemone. This is a shallow water anemone from Florida. The body of these anemones will inflate to about 1 inch in diameter and up to 4 inches long, and the tentacles will inflate to a length of about 2 to 3 inches from the outer edge of the oral disk. These anemones change size a lot, and can go from fully inflated to fully deflated in a very short period of time. When completely deflated, they are about the size of a small marble, so if it seems to disappear suddenly, don’t be alarmed.
Like most shallow water anemones, they are photosynthetic, so they will need good lighting in your system. They should be fed several times a week with some sort of meaty food, which can include marine pellets and even flake foods. These should not be put with seahorses because they may eat the horses, but most other fish will figure out not to mess with them. They may move around in the tank for a while, but will eventually settle down in one spot and pretty much stay there. They are not especially aggressive, and can generally be kept with corals and other anemones, but you should always carefully watch the interactions between new additions and the older inhabitants of your tank..
These are not big Aptaisia anemones and will not reproduce in your tank, so don’t worry about that issue.