What is Reddit's opinion of PH Meter for Water - PH Meter and TDS Meter Combo, Digital 0.01ph High Precision ± 2% Readout Accuracy Pen 3-in-1 TDS & EC & Temperature Meter for Household Drinking, Pool and Aquarium?

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Any chance you could send me the ingredient list on your fish fert? I couldn't find one online. What bloom nutes are you using? Curious to know if it has all the essential elements in it.

For the ph and ppm, there are a ton of options out there. These cheap ones from amazon work just fine. Get some calibration liquid and storage solution for your pH meter and calibrate it every other week or so. Be gentle with it, take care of it, and that $10 meter will last you a while. I break one about once a year. I have had my ppm mmeter for a while and its lasted. Once you kind of learn your nute routine you'll know roughly where your ppms and ph should be after mixing. I know that some organic nutes can throw your ppm off but I do not know enough about the topic to comment.

I also do not grow outside, so if it's some weird environmental factor that I have no knowledge of, we will just be shooting in the dark. Also, if you have more pics of other leaves, ones that are just starting and ones that are farther along that might help a bit.