Sorry for the confusion. I adjusted the
nutrient solution to get the PH to 6.0. As a backup I also use the tetra PH test kit to verify and this pic is the output of the test after adjustment.
pH meter needs frequent calibration as its a Chinese make and you know how reliable they are 😜
Water temp is still at 28 deg C and humidity has risen up to 78% RH. Planning to put a fan around to circulate the air and also cool the water.