actually it doesnt really matter how long, anemones can live over 100+ years, if its only been 5 or less years you cant say its doing fine, because you dont know how the long term effect of the lighting is going to affect it. even 10years in the span of an anemone is considered short term success. do you see what I am saying.
alot of people consider having an anemone split in their tank a good thing, a sign its doing great. usually though its a method of survival when the chips are down. and the anemone is sensing doom it splits to double its chance of survival. one side may not find suitable habitat but the other may. Success with these creatures is almost always short term in com[parison to the lifespan of the creature. I'm not saying not to keep them, I am just advocating the use of methods that have the highest chance of success through others expiriences.
