congratulations, you really deserved it. Really impressive work you've done.
Regarding the ferts, did you used the same 20 ml per day from the start to the end?
The fertilization is calculated based on tank volume. but i usually adapt the ml to the tank needs, watching the algae and plant growth.
The dosage where around 20-30ml on the diferent stages.
At the end of the week, if you made po4 and no3 test the results should be around NO3 10/20ppm and PO4 0,5/1ppm, this is my finish line.
Regards,
Luís Cardoso