Mine's 4-5" big. The last couple pics makes me second guess my first guess. Can you post a pic of the tan spots and the yellow foot?
I'm guessing a malu, but that's just a guess. You want to mimic the reef, 12 hours light, 12 hours dark, some reefers only do 8 hours light, but anemone's seem to do better with a little more. What lights are you using? Your tank looks kind of new. That's a really nice anemone you found.