People normally quarantine magnificent, gigantea, hadonni and any other type of bacteria prone anemone in a 10 day cypro treatment. Common anemones like Condylactis, Sebae, Malu, BTA, Rock or tube don’t get quarantined.
A 10 gallon tank filled half way. Egg crate in a corner with a heater and power head. Put a coffee mug in upside down so the anemone can attach to it. Then treat with cyproflaxin. Here is a better link if allowed to post
links?
It will require daily water changes of 100%. No substrate to make it easier to clean.