help scoly

I am not sure but it looks sexy shrimps are eating my breeding apple scoly... Any advice on how to save my scoly? Five sexy shrimps in 13.5G tank. No fish. Water parameter is normal and stable: Alkalinity 7.8, No3 11.2ppm, Po4 0.08ppm Feeding coral food to scoly: Once every 5 days So far, I...