Originally Posted by Seattle_Aquarist
150+ ppm NO3 = Blyxa melt for me; don't ask.....but suffice to say I should have read the instructions on the water test kit more carefully.
You added 150ppm of NO3 from KNO3 by weight?
Or did the test kit say 150ppm of NO3?
I added 160ppm and was gone for 3 weeks, I never had issues with any plants, I did lose some shrimp, but I cannot say w/100% confidence that it was due to NO3.
All fish where fine.
My old tap was at 52ppm of Mg, so 25ppm is not an issue, this is about 10X what most might dose at once or have in their tap water.
I dose 45ppm NO3 via KNo3 weekly, you'd never reach the range required if you do a 40-50% water change.
It is not likely anyone needs more than 30-40ppm a week of NO3, often times, less.
As far as K+, the 2002 winner of the AGA contest Erik had well over 100ppm of K+ at the time of the pic. I've dosed 50-100ppm without ever having a single issue with every claimed plant stunting tip.
This myth became wildly popular back in 2002-2003 for a bit.
PO4, is likely well over 50-100ppm.
Ca++ as well.
Fe, at least 5-10ppm, Hydrilla's optimal growth occurred at 6ppm of Fe.
Nutrient blame game is wildly popular on all forums and web sites.
Rarely do they blame poor CO2 or too much light.
I find that most curious.