Starting the plants off
First time analyzing the pH. The pH of the tank was at 8.4. Brought it down to 5.7.
Two days later pH of 5.9.
Added epsom salt to supply Mg, targeted 50mg/L Mg.
After doing that, EC went up to 1.6, brought it down to 1.4 mS/cm and also reached a pH of 5.5.