The tank is outstandly clean look inside the house. Con graduation being TOTM. Your name sounds like Vietnamese, are you?
Anyways I have some question, it's probably some noob questions, but hey, at least I ask.
What is a close loop?
What do you mean by RTN?
Why did you need to tide the frag tank down?
How do you trim the zoanthids on your tank wall?
I heard you on temp. control. I experience the same thing on my nano, my two fan blew off, but my tank never been running on a heater, they tank constantly at 84s-86s degree.