Athosanswered grow question 5 years ago There are more than 1 issue here, first those puffy and droppy leaves are a result of over watering. Although it is hard to judge with the yellow light, there seems to be a magnesium deficiency going on (you can tell by the interveinal yellowing), with no information of feeding strength, it's hard to say of this a true deficiency or a lockout due over feeding some other element (P and / or K excess locks out calcium and magnesium).