Does that say your temp is 89? Must be a typo. Reason I ask is because I know bacteria multiply fast at higher temps but I never heard of 89 degrees. My other question is why aren’t my nitrates dropping lol? Seriously though I’m having the same issue with vinegar been dosing about 3 months I’m up to 70ml a day in a tank with exactly 82 gallons of water. My nitrates are 25 but will creep up over 2 weeks to about 40 then I have to do a water change. I don’t want to raise the vinegar more and have it lower my Ph because my PH at its highest is 8.1 and lowest is 7.9 does DIY NOpox at a 50/50 solution vinegar and vodka lower PH as much as vinegar? I dose vinegar spread out over 24 hrs to reduce the ph dropsJust to update this post for future use. So I got my no3 down to 5-10 ppm. I stopped dosing straight vinegar then went into nopox around September, then again nothing much was happening (I thought I had too many (14 fish total), I now have 9 fish total), so I went ahead and rehomed some fish. Then I waited another few weeks then again nothing was happening, but then my biggest break through was when I upped my alk to 9.0 from 7.0. My PH was finally around 8 then I saw a steady drop in no3 each week.
I read the relationship between no3 and alk and how it interact with one another so that’s what made me upped my alk. Now everything is steady and back on track. So my advice if your alk is low trying raising it to an 8-9. I was dosing 14.5 ml a day in my 130 gallon system (100 display and 30 for the sump) but since it came down I have cut back to 7.5ml
A few wc but nothing major, haven’t done one in about two weeks. It took about 3 month for nopox after I corrected my own issue so keep that in mind if you want to use nopox. It’ll work but it’ll need some help on your end
Here’s my recent test
no3-7ppm
Po4- .06
Alk-9
Cal-420
Mag-1320
Ph-8
Temp-89
Salinity-1.024-25