First Ever Grow - Pink Kush

In the first photo you can see this little beauty germinated, and ready to be transplanted. The second photo was taken 3 days after transplant and shows the moment the seedling broke the surface of the medium. My germination method was to first soak the seed in a jar of water until it sank. I then transfered it to a paper towl. Once the root was 1/8'' long, which happened by day two, I transfered to my hydroton medium. After three days above the medium surface I figures the seedling wasnt going to shack its seed husk itself so I helped it out. Afterward its leaves fanned out nicely. My was pH quite high at this point, 8.1! as I was waiting on my pH Up and Down to arrive. I had also been keeping my reservoir water level half way up the net basket which iv since been told can drown the roots. After another day of my pH up and down not arriving I went to my local hydropoic store and grabbed some pH down. I did a complete reservoir change, pH balanced to 5.8, ppm 400 and brought the water level down to just bellow the net backet. On seedling day 4 I lowered the light to try and provide optimal light conditions. As they say more is not always better 😖. By day 6 it was obvious my seedling was not happy. Either the change in pH, light conditions, or both were causing distress and yellowing. I asked around for advice and it was also suggested that my seedling may be starving due to the water level decrease. I checked my pH and ppm. The pH was 5.8 but ppm was 500. I took out some reservoir solution and added straight 5.8 pH balanced water. I brought the ppm down to 380. I also raised the light back up to its original position. I also did a top feed of reservoir solution and a foliar feed of 200 ppm solution. I then turned off the lights for 6 hours. Up till this point my light schedules been 24/0. As far as I can tell from day 7 the progression of the yellowing has stopped. My ppm however was back to 500 so I removed more reservoir solution an replaced with pH balanced water. I have a feeling my pH down is increasing my ppm. Im hoping that it doesnt cause me to lower my ppm to the point of accidentally starving my plant. In the following weeks I will be starting a dark period cycle by starting with 23.5/0.5 and increasing the lights off period by a half hour until im at 18/6. Thanks for following. This is my first grow and tips are greatly appreciated.