New To Auto Pots.. Help With Air Domes

As the title says, doing my first run in coco, with autopots aswell. Plants are currently in 1 gallon pots with a 70/30 mix. I’m about to transplant them into auto pots, i got the 4 Pot system with 3.9G pots, air bases and air domes and am a bit confused. I won’t need to use a different substrate on the bottom around the air base and air dome correct, i can just fill it up with my 70/30 coco/perlite before transplanting? Also does anybody have issues with ph shifts with using the air domes? I know aerating water can change ph. Also if you guys have pictures of your setups, feel free to post below. Also any tips/tricks/advice for using these for the first time, fire away. Thanks!

As the title says, doing my first run in coco, with autopots aswell. Plants are currently in 1 gallon pots with a 70/30 mix. I’m about to transplant them into auto pots, i got the 4 Pot system with 3.9G pots, air bases and air domes and am a bit confused. I won’t need to use a different substrate on the bottom around the air base and air dome correct, i can just fill it up with my 70/30 coco/perlite before transplanting? Also does anybody have issues with ph shifts with using the air domes? I know aerating water can change ph. Also if you guys have pictures of your setups, feel free to post below. Also any tips/tricks/advice for using these for the first time, fire away. Thanks!