Yellow Leaf Edges - Potassium? Burning?

[Ganja Guerrilla]

Go back to tap water or you are setting yourself up for a Calcium deficiency later on

very good point

Ganja Guerrilla Reviewed by Ganja Guerrilla on 09-06-2007. Yellow Leaf Edges - Potassium? Burning? Using the rubbermaid grow box Any idea what I'm doing wrong? This is from 08/20 seedling. On 16/8 light cycle. Help! Rating: 5