Been having ph dropping and low ppm...

ph been dropping with low ppm... did a rez change been kinda of steady around 6.0. It dropped back to a 4.5 after about three days. Mixed stinger nutrient solution and just topped it off. Temperature a steady 74-75 degrees. Rez temp around 66-72 seems to not be drinking much either. Humidity has been a lil high around 70% lately but dropping to 60% now.Anybody know what’s wrong?

take a picture of the roots, also is this dwc?

Generally speaking dropping pH is a sign of root rot. Check your batteries, calibrate your pen and first make sure you are getting accurate readings. It could be Nitrogen toxicity but without knowing what you are feeding that's going just by the curl on the end of the leafs. Also smell your roots to make sure they don't smell funky.

Are you using RO water? And what nutrients? If you plants are not eating or drinking @DaFreak has ya covered I'm betting

DaFreak said:

Generally speaking dropping pH is a sign of root rot. Check your batteries, calibrate your pen and first make sure you are getting accurate readings. It could be Nitrogen toxicity but without knowing what you are feeding that's going just by the curl on the end of the leafs. Also smell your roots to make sure they don't smell funky.

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'I concur'