Fighting diatom

I didn't measure the nitrate level. However, when the light on, diatom will break out very fast. Had tried cleaning, water changes but still no use.

Getting a 2nd hand AM denitrator NR1000 from Geo-aquatic. Anyway, I believe the cause was insufficient amount of beneficial bacteria during the tank cycling period.

In addition, had ordered Caribsea live sand from Petmart. The live sand will help to replenish beneficial bacteria in the sand bed. By mixing it with existing aragonite sand, gradually making it 'live' as well. :)