7ml/l is over 1tbs/gallon which would be a highly aggressive rate for a mature plant. Your plant is the opposite of mature. You want a gentle feed rate.
It's important to remember that the feed rates on bottles have NOTHING to do with plant health. Their sole purpose is to make you GROSSLY overfeed. Just barely shy of burning your plants to a crisp. Thus you use the products much faster than needed forcing you to replace them more often than necessary.
It's important to remember that the feed rates on bottles have NOTHING to do with plant health. Their sole purpose is to make you GROSSLY overfeed. Just barely shy of burning your plants to a crisp. Thus you use the products much faster than needed forcing you to replace them more often than necessary.