I have some good news about my Sun Corals guys. They open more now and not that's not all... They open during lighting period, why because I feed at 23:00. The Sun Corals is now of course, in my main tank and the lighting period are 20:00-00:00HR. I feed my main tank at 23:00, which the Sun Corals get a sense. After 15 minutes, I feed the Sun Corals with the pump on at 23:15. The Sun Corals have open more wide than before. I seen more Tentecles now. Thanks for your help guys, I appreciated. I will post some pictures this weekend.