Also that pic is about 2 months old. I have rearranged ALOT, made caves for the corals..but none of the bothered corals seems to care if they are in the light, dark ,flow or no flow . I give them a week or so in place and when there is no change I try something new. I have cleaned and removed some of the front and one side of my sandbed...there were no odors at all. I have moved the brains to my nano and in an hour they open up..they stay shut tight in the 75 24/7. This has driven me crazy to say the least...must too long and still no clue. I went through everything I could think of..even switch out my brute can for a new one thinking something was wrong with that..grasping at straws. I try to keep some measurable phos and nitrate in the tank. I target feed...even use cut bottle tops to keep my fire shrimp and fish away while they eat. The brains just do not open. I now have a nice cynarina the is not opening either..however I do see feeders and it eats..but during the day it stays closed...HELP..and ideas I haven't thought of!? RO/DI TDS 0 BTW.