Jdog has quite a few grows under his belt, listen to him.

I didn't mean to mislead you in any way, I just know that when I first started out and didn't have any pearlite mixed in with my soil, my plants started yellowing, then purpling at the stem and then started getting a little "brittle".

I changed the medium they were in and they were as good as new.

Sorry again if I mis-informed you in any way