looks like a Octospawn. My Octo's rarely shows sweepers. Not saying they don't .
They can come in many different colors. These are just 2 of the Octos. I have
Yours might be the mint green color.
If you are asking about how long it will take to color up. ..I had 2 single heads I ( FOUND ) behind my rock work one day while cleaning. They were totaly bleached. I placed them about 6" off the bottom. And in about 3 month , They Had colored back up to the Purple & green .How long does it take
And why are they always on the bottom of the tank in pics? B/c they are frags?
If you are asking about how long it will take to color up. ..I had 2 single heads I ( FOUND ) behind my rock work one day while cleaning. They were totaly bleached. I placed them about 6" off the bottom. And in about 3 month , They Had colored back up to the Purple & green .
Most are on the Bottom because they really don't require lots of or Strong light . You would save the Upper areas of your tank for future corals which need strong lighting.