Hello and good day! I recently (3 weeks ago) picked up this acropora - it was technically brown, and over the past few days it's been drastically changing colour! Now this isn't like a mild change, but a massive one that looks as almost as if it is infected or going through some bizzare calcification- my water parameters are solid, other than the fact I have more than the standard rates of calcium in the water;everything else is kosher! Below is a picture; any help or opinions as to what is going on would be great as I'm fairly new to the hobby! Thanks!