Can't say for sure, but overwatering is very common. Let the media (soil, coco, whatever) dry out well before watering. Let the roots develop and go from there. goodluck
You can get all kinds of symptoms from overwatering. You are locking out the nutrient uptake ...so yeah...they might need some N. After they recover from being doused everyday.
Do NOT flush them!!! good lord they've barely started. Let them dry and develop their roots and yeah in a few days, they might perk up. Look at the soil, it is saturated.
Too young for nutes. Probably overwatered. Make sure those pots or cups...I can't tell... have good drainage holes. Small plants like that don't have enough root system to uptake very much water. Make sure it is dry before you water and only give a little.