Tomato just got checked.
This looks like vigorous, healthy tomato growth in an indoor hydroponic grow box. The strongest issue is simply plant size: the tomatoes have outgrown the cabinet space, so they are crowding the light and each other. Keeping the light about 3 cm from the tops throughout is very close; that usually does not cause disease, but it can force constant pruning/height management and may reduce overall flower/fruit performance if the canopy is too dense or uneven. If the plants are still green and stable, this is more a space/light management problem than a plant-health problem.
What to do today
Keep the plants that fit the box, and move the extras to separate pots or a larger system. Then manage the canopy so the main fruiting plants have even light and airflow.
Also possible, but less likely
What would prove it
Shift from seedling mode to fruiting management
The plants are past the compact-grow stage. Focus on spacing, support, and flower/fruit set. If you want kitchen fruit, the likely fix is fewer plants per box and more headroom, not harsher feeding.
Turn this into a recovery case
One photo gives a diagnosis. Tracking proves whether the plant is recovering.
Don’t leave the diagnosis hanging 🌱
Save it now, then use the next photo to confirm if this was the right call.
Create account & save plant 🌱