bacto balance

I’ve seen this discussed a few times but I still have questions about switching carbon sources. My tank wb220 about 155-170gallon actual water volume has been running for an over a year and a half, it was started and cycled using media from my previous 9 year old 125g tank. I’ve overstocked it...

Two part question, I’ve been dosing NP Bacto balance for about 5 months. Im currently dosing 1ml daily and it keeps my phosphate nailed at .03 but it’s darn near impossible to get my nitrate above 0. Ive tried backing off my dose of Bacto Balance. If I dose 1ml every 3 days I can get 1 nitrate...