I mixed my second tank of solution yesterday. I wanted it to be around 500 PPM for lettuce, however, it looks like it turned out to be 400 PPM. I probably overmeasured my gallons of water.

Is it acceptable to add more nutrient to try to correct this, or should I just let it run all week like this? I am using Technaflora's BC boost, grow, thrive alive red, sugar daddy, and magical. I don't want to mess up the nutrients already in there, will adding more nutes do that?

Any suggestions would be helpful. I don't know if the low PPM this week will put the lettuce outside of the 30 days until harvest window or not...