The pictures here where taken in 2001
in my very first Anemone tank.
The reasons include water changes or lack there of.
Light changes or old bulbs or lack of food.
There are many reasons for a Rose to split I have found.
The most prevalent ones being over feeding or no feeding at all.
I prefer regular weekly feedings to keep them reproducing
like they do in the wild.
It is how I have acquired so many of them over time.
You can feed them daily, get them huge and they will split for you.
I much prefer to have a huge Anemone that won't split as they can be the showcase in your tank.
Unfortunately they have other ideas.
They will also split from injury. If one gets under a fallen rock it will split to free itself.
If one gets into an intake and is not to badly torn up it will split in order to save itself.
They can be out in the open , or go into hiding to do this.
But the biggest and best sign is the foot being on two separate rocks or one part on
glass, the other on a rock.
Next sign is an oblong mouth. They always split at the mouth, never the foot or side so watch
the mouth, when it starts to get elongated as in the pictures
you know you have a split starting.
When it is separating you will notice an elongation of the mouth , like an oval.
not see any white noodle like appendages around the edges but rather like the usual mouth with just
a little bit of ragged edges.
As it rips in half it will keep moving further apart on the rocks.
The process can take as long as a half day to finish or as in one case I had, 30 minutes.
I find it depends on the size of the original Anemone as to how long it will take.
It takes up to 1 1/2 weeks for the mouths to heal so no food is necessary for either of the halves.
Water changes and pristine water conditions is a must after the split, do a 20% water change the day of the split.
Do not move either of the halves of the Anemone, they may retreat into a dark cave to heal.
Most do. So leave them be and let them rest and heal, they will come out on their own when healed and needing food.
Start feeding with small pieces of a Silverside or Mysis shrimp. They won't eat much so offer just what they
will eat and take away what drops and then feed again the next day.
Keep feeding daily until they are starting to grow and expand.