Aloha, Grower

I'll leave sources and strains to them that know.

But, allow me to address the 3rd question.

Before you invest in "snake oil" browse the link in my sig.
Just some good advice.
"With nutrients, enough, is plenty. More, is too much". - Weezard

Like a gentleman here said, "we are not raising cows."

Best of luck

Weeze