Now that you have two experiments running you will need to take notes on each everyday.
Make note of any changes. If your plants are showing above the media take measurements and record them.
It is time to put your 5x5s under the lights. Now all of your growing experiments are in the 1020 tray under lights.
You can now water your experiments by watering from the bottom. You will need to water whenever the coco coir around your plants look dry, about every other day. Do this by adding a few cups of water to the bottom tray. The coco coir will absorb the water and bring it up towards the plant roots as long as the water is high enough to touch the holes in the bottom of the trays.