Critical Orange Punch-My First Grow

The ph is 6.5 or a little more, the night temperature is 19.5 or a little more. These days I'm using rainwater and to lower the pH I use wine vinegar. Every day I lowered the plants more and more until I obtained a complete exposure of the whole plant to the light. I added less than 1/8 of the recommended dose of fertilizer. The night temperature has risen slightly, it is close to 20 ° but does not touch them.