Help my new leaves are cracking :(

These started to show after 3 months in, any help or information will be much appreciated!


2) Growing indoor
3) Watering schedule 3x a day
4) Growing Medium hydroton/ clay pellets
5) stage of growth vegetation

How many ppm I'm guessing low ppms three months in veg wow how's the whole plant looking does it look over water..

Hi!

Unfortunately I don't have an EC meter available here in my country but here is what the whole plant looks like



I suspect it's a nutrient lock due to me not flushing the whole system for 3 months, I have read just today that I should at least flush every 3-4 weeks.

You can get everything you need for a hydro set up...but you can't get a ppm/tds pen?

I ran out of budget, I will be getting it shipped from abroad once I get the money, the customs here is a rip off so I'm improvising any means that I can. Thanks for your response