When you plant from seeds, then add water level till the Min. water level, you don’t need to add water within the first 10 days as seeds don’t need much water at the beginning. When plants have more leaves and they will need more water, then add water below Min. water level but do not add too much water into the tank which exceeds the Max. water level mark on the indicator or higher than the Min. water level, both will hurt the plants’ growth. Keep water level between the Min. and Max. Mark (blue area) is always a good choice.