Got the grow going this year it’s budding at the moment. i seem to have an issue with my blue cookies plant. this issue is happening mostly to older leafs. I can’t seem to pin point exact problem so I’m here to get some help so I don’t mess her up with bad trials and errors. i have noticed that this plant doesn’t drink same amount of water as my other two in fact it takes less on regular basis. here’s the picture of leaf. the leaf of self is some what dried out and snaps off really easy. hopefully I can get little bit of help thanks for your time guys (p.s. thinking it’s phosphorus deff or excess ?)