The very high NO3 is normal for the end of the fishless cycle when the tank has so few plants. As you are already planning, big water changes, then it is ready for fish.
Not familiar with that light, so I cannot comment on how bright it is, and if you need CO2. If you can set it up at a low level and keep it going that would be best. Not turn it on and off.
Not familiar with that light, so I cannot comment on how bright it is, and if you need CO2. If you can set it up at a low level and keep it going that would be best. Not turn it on and off.
