First indoor grow. Need help

Just found this https://www.rollitup.org/t/does-coffee-grounds-help-marijuana-grow.64777/post-1480669 just in case your lacking other nutes.

Here are some pics that i just took:
Still they are relatively small but i planted some more seeds and hopefully they will catch up as I'm starting to understand this coco stuff.

Hey everyone,
My ph test kit just came in. I’ve never used it before, should i sample after i add the nutes and CalMag?

Calibrate it first, then yes after you add nutes use it.

lime73 said:

That's your issue, ph is important for plants to absorb nutrients. Having ph at whatever your water is, is effecting your plants, they are having a hard time cuz your ph is off.

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Can u use distilled water bought from a shop without using pH up/down??

Bignutes said:

Calibrate it first, then yes after you add nutes use it.

Click to expand...

thanks. I dont really know how to calibrate this thing but it’s probably simple enough to google.