Day #9. Daily WC and mechanical media replaced

I came across a shop that have a Nitrate removing filter media. 

I stuffed a couple of set between the top filter partition. 

Same WC regime.

30% water displaced with Aged water.

This was continuously performed every night, making tonight as the 9th WC in 9 days. 

Here is the result. 

Ammonia is 0. 

Nitrite is 0.

Nitrate is 40-60.

All measured in ppm, parts per million.