General plant updates: Both plants are showing their characters. Stretchy has roots to match, long and stringy. Fatty's roots like to creep and wrap around the pot.
Feeding: I haven't added any nutrients this time around, only topped off the water. The true leaves are starting to peak out, though the plants are still heavily relying on their first leaves.
Lighting: I took away the small red/blue light that I was skeptical if they had ir/uv, a few days later the leaves showed some white veins so I put the light back. I'll update next week if it has actually helped or not.