The problem start with my 250w DE pendant. I guess placing it 8 inch above water level didn't do much much but burning the acro tissue only. I refuse or can say too stubborn to move it up. After many death, I decide to move my lazy bone is shift it up to 14inch from water line.
After 2 mths of tender loving care, making kalk to drip, adding DKH buffer and checking pH everyday. The acro is smiling back at me with its rainbow smile ..