Ok so i bought the one hammer coral i posted a pic of on friday in my bio on here. looked fine , yesterday half of it was sucked in didn't look right at all today a big chunk in the middle is dark brown and eaten away meaning its rotting/ dieing what would cause this so drastically with a hardy coral ? All my other corals are fine the other corals i have are star polyps finger leathers, acan, tongo mushroom, toadstool. any advice would help alot i paid 100$ for this coral :(