Final update:
So I checked the pH again today (day 3) and it is still the same as the tap water, pH 8.2.
I've decided, however, that I don't want to risk anything so I got a bag of Argos sand yesterday and will be using that for my tank.
Although I initially wanted to go for the dark substrate look, I really like how pretty the sand is. Looking forward to the delivery of my tank today and finally being able to get started with setting up and cycling!!!
So I checked the pH again today (day 3) and it is still the same as the tap water, pH 8.2.
I've decided, however, that I don't want to risk anything so I got a bag of Argos sand yesterday and will be using that for my tank.
/mangrovesandmore.co.uk/caribsea-caribsea-complete-planted-aquarium-black-20lb-p-57.html