Update:
It's been almost a month after the GHA bloom & up to now it has not gone away, in fact have gotten worst to point that I have decided to transfer all my corals to my 100gals tank for the meantime.
The lawnmower blenny I bought survived only for 2 days, maybe was overwhelmed by the sight of his task to consume the enormous GHA in my DT
Had some casualties since including a Large HYT brought from Hkg by my Bro. A Sunburst Anthias which by the way came from Weds (Sorry), this fish was truly cherished & well taken cared of until these problem came about. A Green Mandarin which was MIA for a week now. All the featherworms & almost 20pcs of Turbo Snails!
Will be removing all the LR in my sump as well as rockscapes & sands as per advice of MMA. No choice but to start proper cycling again hopefully soon. Oh well.....