Hi
@mrhoyo
Both your nitrate and phosphate are at very low levels, particularly the nitrate. I'd be tempted to firstly increase nitrate to 20 ppm using something like
TNC Complete. This will likely increase phosphate to around 2 ppm, which is a bit higher than I would have liked. Ideally, we'd use separate fertilizers for nitrate and phosphate. A bit of trial and error is called for, I'm afraid.
You'd be wise to replace the API Phosphate kit with the JBL PO4
Sensitive kit. The first of these is insufficiently sensitive as it jumps from 0.0 to 0.5 ppm.
JPC