Originally Posted by barchtruong
Sun coral needs low light, strong flow.
If you have no flow in tank, it won't be happy.
closing up for 3 wks don't do harm to it.
It can say close for an extended period.
You should post a pic of the tank along with the water paremeter so people can help you
sun corals do not use photosynthesis, so it really doesnt matter if its low light or not. But I wouldn't keep them under direct light because if algae starts to grow, that will overgrow the coral and kill it. Keep it under shade is best. It needs to have somewhat moderate flow across it and not directly.
keep putting mysis shrimp on its skeleton and let it sit there for 20minutes, and do this everyday or so at the SAME time. Once you do this, eventually after couple of days they will open up at the same time.