Cycling question

[Aquattro]

Almost a complete cycle, I would think. Did you add RO to the tank then add salt? That would have killed any remaining bacteria in the sand. Just take some readings over the next week and see what the NH3/NO2 does. When it's gone you're good to go.
Just an FYI, NH4 will be almost non existent in pH 8.0 solution, with most being NH3.