I have a sun coral for few months. It was opening up nicely. For the past 2 weeks, the polyps are not opening up as much. pH is 8, salinity 1.024, change water 10% every week for 2 weeks. Is it too much light? Does anyone have experience with sun coral. I feed it plankton, cyclopedes, mysis. I don't pipette the food on the surface because the shrimps and other inverts will come and eat the food. Any suggestions? Thanks