@COamateur
I use an extra tray when I am watering. I put about 1" of water into the empty tray and then move my pots or seeds trays into the water for 30 minutes. I then move them back to their own tray and return them under the lights. I know this sounds tedious but it gives me something to do as well as allows me to inspect all my seedlings. I do this every 4 days. Some of my pots (small yogurt containers actually) are bigger than my seed trays and so take longer to dry out so I may do them every 5 days or the seed trays more often (every 3 days). It is important to watch the colour of the soil on the top of the trays and only water once it has become dry (usually shows as a lighter brown). When you place the trays in the water you can watch to see when the soil becomes dark again indicating they have enough water. Don't leave any water in their trays as this may lead to root rot. I hope this all helps.
