Here is the deal, anemone get about 90% give or take of their energy from light. Most of the time this is the case:
Anemone have a VERY slow metabolism, by the time you realize what is going on, its already in decline.
Anemone have horrible shipping records and captivity records, I believe I read once like 25% fail to make it to market. Of those that do, a "success" is considered a year to five. Normally these creatures live for hundreds of years in the wild. The others that survive to the LFS are often sickly and in decline. Most are unaware that the first couple of weeks will make it or break it because of this. When getting one home, you need strong, intense lighting to provide the intensity to produce that 80% of its energy. If you are on the ragged edge and only supply a portion of this light you can offset the deficit by feeding more and more frequently. This works all fine and dandy until it splits and you can't supplement that deficit any more. To make matters worse, it needs even more energy now to heal the split. It gets smaller and smaller and then dies.
Happy anemone do not: Roam, (Though BTAs do more frequently, which is why I suggest selecting the Sebae as they do not), detach, gape, turn inside out, etc.
Constantly moving anemone do not like the water quality, light, flow. Roaming takes energy, which will use precious little reserves.
Anemone do not have eyes, they don't know where the light is and they need to be placed in a rock structure that lends to their proper orientation. BTA's tend to like being wedged in a crevice.
BTA's loose their bubbles over time and get long and skinny tentacles in captivity.
Clown fish trying to host in a sick or stress anemone only make things worse and literally can rub them to death. Often after a split the clown is so large its WAY too big and a mis match further complicating the situation.
An anemone should feed with intensity and react to food when placed on the oral disc. If it does not, it does not know it is being fed and needs to be more often.
In the end, it boils down to light. Yes, I have heard of the guys that kept them under Bic lighters and they split every week, but that is not the average result.
Without strong light, they all die in the end. Unfortunately because of the slow metabolism thing, most aquarist are not aware that it is slowly starving and attribute the death all the while to something else.
How do I know this, because I was that guy. After I got MHs it magically got easier.
Throw a JBJ Viper 150 on it and you will have a fighting chance, but I'm afraid that is where you are coming up short.
As always......IMO, not set in stone, different strokes for different folks....blah, blah, blah....