I’ve had my frog spawn coral for almost a year now, just about as long as I’ve had my tank. It’s been doing well since then. Within the past week I’ve noticed it seemed to not be opening as much and is now receding. My water parameters haven’t changed and the only thing that fluctuates a little is alkalinity because I dose it manually. Any idea what could be going on? Do corals just sometimes die for no reason? Thanks for any input.