Thank you for everyone contribute to the post. Advices from everyone really helpful
I think until now the N-Cycle is finished, there is a diatom bloom 10 days after the tank setup and diatom getting less after few days.
Looks a bit strange to me too because the other tank setup few years ago get normal N-Cycle. This is my first time get N-Cycle finish so quick.
I guess here is the conclusion, please correct me if anything wrong:
1) Use artificial live coral, less dead organism to generate ammonia
2) Live sand come with beneficial ammonifying / nitrifying bacteria
3) Active Carbon, De-Nitrate, Macro-Algae absorb ammonia, nitrite and nitrate.
4) Oversize skimmer removed DOC which help to minimize source of ammonia/nitrite.
Here is the update of my tank, so far haven't change water since trying triton method. Most water parameters looks great, except KH but still in acceptable level.
Water parameter
NO3: 0.0
PO4: 0.0
KH : 7.7
Ca: 480
Mg: 1500
Salinity: 1.025
pH: 8.06 - 8.18
How it looks now All frags look really good but need time to develop a larger colony.
Thanks everyone again. Happy reefing.