I've got a 10 gallon under a Finnex Planted+ 24/7 SE light that's on 24 hour mode. I consider this to be ~ medium light.
I'm dosing PPS-Pro macros at 1 ml/day and according to my calculations (thanks old chemistry book) and this site (https://sites.google.com/site/aquati...r/home/pps-pro
) that should give me 1 ppm/day, or 7 ppm/week.
But I'm constantly getting NO3 readings that creep up towards 30 - 40 ppm by the time Friday rolls around (cleaning and water change day).
I've got the tanks stocked with amano and red cherry shrimp, 1 mystery snail, 1 nerite, 7 cardinal tetras, and 6 CPDs with is ~110% stocked according to aqadvisor.
My main questions are:
1. Why does the website above say 1 ml/day equals 1 ppm (and thus 7 ppm weekly), but the GLA website (Our PPS-Pro Fertilizer Pack ? Just Mix & Dose ? Planted Tank Blog
) says 1 ml/day equals 14 ppm weekly?
2. are the livestock in the tank really providing that much nitrate weekly?
Tank is pretty heavily planted with amazon sword, hygrophila species, crypt species, moss, java fern, and dwarf sag.
so, the GLA website is not correct. I just manually calculated the ppm of NO2, K, and PO4 (stoichiometry for the win!) and got very similar results as those reported on the first website (within rounding errors), accounting for adding 1 ml/10 gallon/day.
I'm still confused why my nitrates are so high after 1 week of dosing, they shouldn't be anywhere near 30 ppm. It just does't seem like the livestock would jack the nitrates up that high.
I'm guessing that the most reasonable answer is that I mixed up the macro solution wrong.
I think that the macro solution should be ~ 40,000 ppm, so diluting in another 1000 ml should give a nitrate result of ~ 40 ppm.
If I've made an extraordinarily stupid chemistry mistake, would some one please correct me.