Its looking great
Patience is the key when it comes with planting HC , i had kept it for 4 weeks before filling my 29g up , and i have noticed that HC grows like crazy when emersed with good lights , i also used some excel .
So, in your case if you dont want to drain the water out , you could wait cause HC will fill but would take more time.
Personally , i never had much luck with anchoring HC .
PS : "Padang" doesn't that mean open field, i recollect reading somehwre about it when i was in Singapore