What were you doing for Iron when you were doing Burr's micro formula? How much of it were you adding to the micro mix?
Iron by itself does not stay in the water column for the plants to absorb through their leaves, so we complex or chelate it with something else to keep it in the water. These complexing/chelating agents are pH dependent - some unbind from Iron at different pH levels.
DTPA Iron tends to be better for us, especially when our pH goes over 7. I'm not sure if EDTA is easier for plants to absorb than DTPA, but Thrive uses both types.
I think it was a .2ppm iron mix I had, dosed 4x a week. pH with co2 is 6.2
Originally Posted by Seattle_Aquarist
Thrive + is tanks with a pH of 7.0 or less because some of the iron in the nutrient is EDTA; when you use up the Thrive + you may want to change over to regular Thrive or start dosing iron in ferrous gluconate or EDDHA form.
However, I don't think iron is the primary issue this time.
1) Are you conscientious about doing weekly water changes? What percentage do you change?
2) Do you happen to know your nitrate level (ppm of NO3)?
Right, I have used thrive+ before and may be important to note this issue didn't start when I switched to thrive+, it started around the time I saw the Iron issue in Staurogyne,
Which if you saw the insane amount of Clinopodium and Limno Rugosa I had in that tank, it was probably stealing most of the nutrients.
I do 50% waterchanges every Sunday,
I don't know what my actual NO3 PPM is because the nitrate test kit I have gives me a bizarre range.
I was on EI 2 weeks ago and I was dosing:
8.35 PPM NO3 Every other day
Now with Thrive+ I guess I'm closer to 7ppm NO3 every other day, but it has Urea in it I believe so actual N should be higher