[Maryland Guppy]

Nitrate is coming up as 0 / yellow.

So this means the extra light is bad?!

No ferts or dosing or anything else.

Extra light is not bad.
The light is like your gas pedal in a car.
Driving the plants harder to grow.

With no food they will eventually perish.

A great informational site is here.
https://sites.google.com/site/aquaticplantfertilizer/home/pps-pro

 

[Maryland Guppy]

leave it as it is, starting adding ferts and then see how things pick up

You may see a turn around and in the near future and replant the tops of these stems.