you still shouldnt be too worried, 6.5 isnt too high, my tank water is very alkaline and i have trouble keeping ph below 6 with the plants feeding heavily for a decent amount of time and i dont have any trouble (until i got bacteria from the tank dammit). Im sure that the optimum PH will make growth better but plants are able to handle fluxuating ph from what ive seen and read. So i wouldnt worry and you should see better growth in a few days as long as the PH is the only thing causing any issues.
You sound like you care alot about your ladies so keep up the love and they will pull through and make you proud

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