A drop per gallon of super thrive wont hurt. I only use RO water, and for small plants I'll Iet em' get a bit bigger on the roots then go to around 200 PPM on a three part nute with a dab of great white.
the top should have been removed as soon as they broke surface. They need constant air movement to breath. I give mine straight tap water for 4-5 days, then 200ppm for a week, and then 300ppm for a further week
Water here kills plants within a friggin week in Fla. In Ky I PPM was 180 or so, here it's 500+ and PH 9+ city water sucks down here.
I'm not sure what you're asking so sorry if this sounds condescending. But you add nutrients to the water so the strength of the nutrient solution is about 200 Parts Per Million. You measure this with an electrical conductivity (EC) meter, or TDS meter. Sometimes this is expressed as Parts Per Million (ppm). The higher the strength the higher the number Add nutes until the nutrient solution reads 200ppm (0.4 milliSiemens) for one week. After this time you will need to raise it to about 300ppm