some of the smaller leaves on my flowering ladies have started to turn purple? sounds a good thing but im sure it isnt. although i dont no the strain somethings up. the pic is 20 days flowering and zoomed in so appologies for the quality. my last grow did this on 1 plant and lost a lot of leaves, they didnt exactly die like dry out/shrivel up or anything. they were just very loosly attached. ph is ok at about 6.5, temps are good at around 21 and humitity is fine. im growing in soil and they have had 3 feeds of floraseries bloom nutes so far. any ideas? thanks in advance.