Dude, your Ph is way too low. Really acidic. Your Ph needs to be between 6 and 7. Although five doesn’t seem too different to six or seven, the difference is massive, especially with such young plants that won’t be able to shrug it off as easily. For example, a Ph of 5 is ten times more acidic than a Ph of 6 and is 100 times more acidic than a Ph of 7!!!!!!!! You need to get this sorted matey or they will never thrive.
Let me know if you have any questions about it.
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