dwc advice

this is my first time doing dwc im growing blue cheese in a 1m x1mx2m tent under a 600 cooltube im at the 6th week in flower mark and my leaves are turning yellow brown around buds i use advanced nutrient a&b was also using big bud but switched to overdrive.i use tap water which is ph7.2 and ph down to around 5.9/6.0. 840ppm my temps are around 75f in tent humidity around 60/65the past 2 weeks since switching to overdrive she not drinking as much as she normal . i have a sour kush plant in coco thats not having this problem i was expecting to make mistakes my first time its just important i learn from them lol i will post pics soon as i can. any advice would be appreciated

pics of buds

Those look rather problematic for six weeks in flower and smallish.

What is your ph doing on a daily basis dropping? If so that means too much nutes.. 840ppm is my top range for my DWC buckets.

What is the ppm of the tap water?

ph was dropping last week which is first time ive had my ph drop i change bucket every 7 days normaly i ph. to 5.5 and over the day it will raise to 6.0ph and normaly stay at that.till next change i was over feeding early on in grow and was advised to drop so ppm down which i did and plant had a full week of ppm and ph staying the same and water level dropping only really started haveing this problem since i stopped useing the big bud and started the overdrive.i just changed the bucket this morning and just added plain ph water. my tap water is around about 240ppm hard water.this is pic i took last week.thanks for your reply

i would drop the ppm by 30-40%, and flush first, im thinking salt build up.

Id do a 24hr with Florakleen,then also drop nutes to around 600ppm


BEECH

ok thanks for replys