Subsrtate ph is too high

Thank You for Your answers, friends. I have an expensive 7 in 1 water tester and will test my outflow when my babies rise a bit. Now I'm afraid to ower water them with drainage experiments. Thank You @Roberts for the explaining about coco coir, I didn't know that. And thank You @GrowingGrannie for wrighting exact ph I should water my little ones. I closing my question with a calm soul and steady hands. 👍

Don't worry about having too many questions! It's ok!! I had the same worry with my first grow... I was growing in ProMixHP (not coco) and couldn't understand the problem.... well, the "problem" was that ProMixHP has a natural pH of 7 and while the plants were small, their roots didn't extend out to the soil I was testing which was dry for the most part - so naturally I worried! As your plant grows larger and the root system gets bigger, you'll be watering further and further out and changing that pH to the 6 you want it... just make sure the water you're giving (and the nute solutions when you start them) are pH'd to 6 and you'll be just fine - as will your plants! No worries here, buddy, no worries at all.

I made my substrate from ph 6 soil mostly, adding 10-15% of buffered coco coir (cal-mag solution) and it was also ~ ph 6. And ~ 20% of perlite. Added 'Micor riza' and 1/4 doze of 'Bat Guano'. - Why it became ph7? - What I did wrong? - How to fix it (my plants are on their second week already)? Sorry, I have too much questions for one topic.