Here's mine. Camera captured only half of the anemone. It's a little stressed now and is still looking for a good spot after I transferred it to my new 60 gallon from 40B. I would say mine is easily 4-5 inches big.
I paid $30 for it...it was marked as a green BTA. So I got lucky in that sense. Otherwise they retail $69-$100. It hasn't changed much since I got it 2-3 months ago. It's a very nice and hardy anemone.
My tanks is about a year old it's a 75dt with a 55g sump/fug. I no it's overkill but I made it with what I had. I all ready have a rbta I've had for about 3 months and a GBTA I had for about two months all doing well I do bi weekly water changes and test my water weekly. When I say rainbow it has pink green and a redish colors like the ones you folks put pictures up of by the way they are awesome looking. All and my lighting is two 120 Chinese LEDs
My 2 pictures were taken about 6 weeks apart. After 6 weeks under LEDs, notice all the bulbs, nothing else changed, and they were under 2x250 MH before the LEDs, curious if anyone has seen a change after LEDs.