fully trained sun coral

might i ask how you train it to open up like that during the day?

Feed it at the same time every other day. Now they will remain open only for a certain amount of time if they are in full light. Usually I feed mine 2-3 hours before lights out (in a separate container) and they usually remain open when I return them back to the main tank, later at night they expand even more.

s cool ive never seen them open likr that during the day

..In a separate container, Interesting! and clever. No stress? Im about to purchase some soon. Good work!! I have some green-ish/black baby Dendro's that came in on a oyster I'm pretty excited about. came half dead now after feeding there flesh is slowly coming back. Thinking that they are black dendro's

I've scuba-ed on deeper (75ft-ish) reefs in Costa Rica that were covered in sun coral that was wide open, at 2 or 3 in the afternoon.

Maybe it is depth-related. Maybe because it was a reasonably stormy day.

For sure, the water wasn't crystal-clear and the coral was probably feeding.

Just sharing a data-point. No real conclusion.

your picture is lovely, by the way. thanks for sharing!