Weird one here, using canna aqua Flores in my Wilma, also have an airstone in there. Tested my ph yesterday and got a reading of 7.4 so I really calibrated my meter, tested it, works fine, made up a feed for my Coco hand watered baby's and the pH was at 6.5 which is where it normally sits, so I'm confident my meter is ok.
The issue is, my plants look really healthy..... Any ideas?
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