dosing at the water change.

Started dosing ferts 2 months ago but the last 3 weeks my plants were looking a bit off.Low light tank and plants.This week for the first time I did my first weekly dosing when my water level was 50% at the change and 3 days later the plants are back to looking very healthy after a drab 3 weeks.

I will cut back on my mid-week doses to see if I`ve been overdosing because of the low light but it appears when the ferts get dissolved they do a better job.

Potassium dry mixing in glass of tank water,No3,phosphates and trace from bottles of solution made with Ro water.