well you just got to a low nutrient point a lot sooner than you should of
This is fine providing the inhabitants do not react to sudden change and you have enough Min-S going into the tank.
For a system not running full Ultra lith having 5ppm of Nitrate is not a bad thing, but we will try and get that down over time also.
So yes please do as instructed
2 DROPS of bio every 3 days
4ml of Bak a day
Keep the Min-S as you are
We will the re evaluate in 5 days, contact me anytiime if you see a change that you are not sure about.