Loss of oxygen from air filter, wilted but came back.

I dont like to burn the seed leafs (that 2 small at the bottom) They help the plant a lot at the very early stages. There are growers that say not even need to give nutrients till they are nice green as they are all for the start. For 2 weeks i will start again i dont like to have problems any more at the end

Leaving the air intake closed for a night could create an environment with insufficient fresh air, which might have some impact on your plants. However, the severity of the situation depends on various factors such as the stage of growth, temperature, humidity, and the overall health of the plants before this incident. Here are a few things to consider: Stage of Growth: If your plants are in the early stages of growth, they might be more resilient to a short period of low air exchange. Mature plants, especially during flowering, might be more sensitive. Temperature and Humidity: Check the temperature and humidity levels inside the tent. A lack of fresh air can lead to higher temperatures and humidity, potentially causing stress to the plants. Observation: Keep a close eye on your plants over the next few days. Look for any signs of stress such as wilting, discoloration, or slowed growth. Adjustment: Ensure that the air intake is open now and maintain proper ventilation. Plants need a constant exchange of air for optimal growth. While the overnight incident might have stressed the plants, they can often recover with the right care. Make sure to provide them with proper ventilation, monitor their condition closely, and adjust other environmental factors as needed. Plants are quite resilient, so there's still a good chance they'll bounce back and continue growing. If you notice any significant issues, you can address them accordingly.

It's absolutely no oxygen problem 😅 , it's a nutritional problem or a watering problem/ soil problem

This is a nutrient issue, nothing to do with oxygen levels. Probably stunted due to being started in waaay too small cups.

the tent being closed one night with slightly limited exhaust/intake was not the cause of this damage.

Even though your intake was shut the Extractor fan will have still managed to pull air through tiny holes in the tent so you should be fine. Just make sure you always keep your intake open in the future.

Only the time can tell you… but because grow box are more impervious to light than air: LGTM. ^^ It could have been worse if the extraction had failed.