Hello! I am rather new to reefing and I bought a Xenia as my first coral. I bought it two days ago and it perked up immediately after I put it in the tank to my surprise. However today I made my flow too strong, after realizing it was two strong (2 hours later). I turned it off but my Xenia is still is a Grey color instead of its usual pink. Is this normal? And if so, how long does it take to bounce back?