Hey it's not dead, after watering it yesterday stood back up again. About pH, I also have an "electrode" like tool which I used to measure the soil and it's around 7.5, isn't the right range from 5 to 7?
I've always heard 6.2 - 6.8 for soil. I'm pretty new to this as well. Big thing that had me at first was the whole watering. You hear don't over water, don't over water, let it dry back, let it moist back. It's all on what you are using brother. I love to repeat over and over. When it brought up," over watering". It's about the frequency and not the amount. Sure you need to keep a good understanding of the time and growth rate. That should be a good comparison to what's going on underneath. Also yes old soil would need to be reintroduced to a new supply of nutes. Don't let it get to you. Try multiple at a time and try new methods. What works for me won't be what is best for you. Find that good practice, learn, and become confident! I was right there with you about 4 months ago.
This scheme illustrates Ph range for soil and hydro.
I'll tell how i understand how it works.
I grow is soil so i use the right side of the scheme.
In theory the scheme shows the correct ph level is 6.53.
It also shows a range Between 6 and 6.8.
2 things worth taking notice of.
1st we can't keep the soil at 6.53 all time.
2nd as i think someone mentioned you can't really measure that.
I'l explain why, if interested.
So i can only use ph meter reading as a point in the right direction.
Ph strips are more precise in real life use but a calibrated ph meter can also do it.
The soil changes the ph value.
When it's wet the ph is a bit higher and when it dries it gets more acidic.
That swing in ph makes sure the plant gets the different nutes i needs if they are in the soil.
That's why i chose my soil with 6.2-6.8 ph range, but i don't think it need to be precise like that. I have grown in slightly different ph range too.
But in the end all we can do is trying to stay in that range estimating with a meter or ph strips.
Correcting if things looks off.
There was a time we didn't use meters to measure when we grew something.
That is also worth remembering.
Sorry if it was a bit confusing but i'm a little tired.