It looks to be over watering. Next time you water them then wait to see how long it takes them dry out till they just start to wilt. Then water just before that from then on. so if it takes 4 days to start to wilt then you know to water every third day.

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we have traveled this way before but there is still much to learn...My indoor grow in Hawaii http://www.rollitup.org/grow-journal...ow-indoor.htmlmy White Russian grow. http://www.rollitup.org/grow-journal...finish-31.html