The one with the red cup is the one that has the most boating.. It is also showing alot of red throughout out the stalk and into the leaves thinking this is just the nutrients leached out of the soil and into the plug area providing to much at this stage.. I am just spritzing the plugs with water when I do water so that the moister is better kept in the direct location although I do know it went completely stop it amp; until the plants old enough to handle the notes the red may not stop