Hi, I just have 2 or 3 coral in my tank. I got a sebae, it were fine last week. It tenicle were flowing around and it open up. Somehow this week it receeding or close it tenicle. I have run Bio Pellet for 3-4 weeks now, could it be the fact that my biopellet is kicking in? And my other coral are also close up. Help please, thank you.