first off, the fan leaves always turn crappy, during flowering, perfectly normal, while the plant draws stored nutrients from them ... however, that usually shows as yellowed leaves, you seem to have a different thing going on there ... possibly, calcium/magnesium deficiency, and/or acidic soil ... how long have you been using distilled water ? ... distilled is not good, has none of the trace elements the plants need ... I would resume 1/2 strength flowering nutes, once per week ... also, don't water daily ... thoroughly drench your plants, then let them dry, before watering again ... make sure they are draining well, poke a pencil up thru the drain holes, (in case the soil compacted, and restricted the draining) ... plants uptake nutes when dry, cannabis needs to go thru 'wet & dry cycles' ... keep us updated to your results ... happy gardening ! :thumbsup: