Hello Zapins and thank you for your interest.
Sadly, I am an impatient person. I started doing too many changes and have recently changed my regime once again.
I will be doing the following for the next two weeks and see if there's any positive change to the tank's current condition.
After water change on Fridays I will add:
.75 tsp of K2SO4 (12.6 ppm of K)
I will not add any GH booster since my tap waters GH is 8-9 degrees.
1 smidgen of KH2PO4 (.711 ppm)
.25 tsp K2SO4 (4.1 ppm of K)
1/8" tsp KNO3 ( 2.34 ppm of nitrates and 1.47 of K)
CSM+B solution dosing .05 FE
And 1 smidgen of DTPA 10+ to get .15 ppm of Fe
Total amount dosed in a week:
Fe : .6 ppm
N: 7.02 ppm
P: 2.133 ppm
I will definitely stick to this dose this time to see the effects on the plants.
I assume the total amount for each fert is more than enough for a heavily planted tank.
I will update later in the day with pictures.
Im sorry for not keeping up with the thread and thank you all for the interest.
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