Thanks, again sorry my photography skills leave so much to be desired. But I know people like pics, I love them, and so I posted a few just to give a little and not just take.
I'll do a brief history, the seven year old one, I'll say brownish/red based anemone, was about 5 inches across when I got it. I found it at a lfs here in Los Angeles. It wasn't bleached and its base was in good shape. It had just arrived that day or maybe the day before. I put it in a 29 gallon tank with two 96-watt PCs. It grew quickly with my regular feeding schedule and so I decided to get a larger tank and transfer it there. I put it in a 50-gallon breeder with PCs and it continued to grow. At one point it measure about 18 inches across.
One day, about 4 years ago (I know because I jot down when I make purchases) I was in that same lfs and there was a little purple based anemone. It measure about 4 inches across and it too had just arrived--not enough time for the lfs to mess it up;-) I at this point had been reading and was familiar with the term allelopathy and I'd read Ron Shimek's book about host anemones and the dangers of mixing them. But, I could not resist. I had always wanted a purple based ritteri and there was a perfect little speciment. So, I put it in my 50 gallon with the "old" one. It took it a few weeks to find a spot it was happy with, but soon settled in and started eating. Anything I fed it. It grew fast. Even faster than the other one had when it was little. Along the way I upgraded to MH, which they took a while to acclimate to.
Almost exactly 2 years ago, the purple one was measuring about 12 to 14 inches across. It would make it's base very wide on the rock, like it was trying to put its whole basal disc around the rock. I thought, "is it trying to divide?" It did this several time over the course of months. Then, one day I looked in the tank, and the "old" one seemed to be dividing. It was wide like the purple based had been (though to this point the purple based was still just one). I thought either it's dividing or it's dying. I looked into the tank and could see the liverock through the mouth of the anemone. I was cautiously optimistic that it was dividing. It took it about 14 hours to completely divide. BTW, it's basically the same process as when a BTA divides. Within a few days, the purple based did the same thing. It's split seemed to take a little longer and the smaller clone looked especially ragged. In both cases, one side of the split was at least two thirds larger than the smaller side.
Anyway, that two years ago and now I have four. I separated the purple from the "old" one so they could grow more freely (4 mags in a 50 breeder is a little much). The "old" one is not as big as it was before it divided. It measure about a foot. The "baby of that one is about 6 inches across. The purple based ones are about a foot for the larger one and about 8 inches for the smaller. The old one is under T5s now and the purple one is under MH.