Projman- it's always a good idea to start weak, and work up, noting your EC all the way. Every strain is different, from Sativas that are finicky, light eaters like an anorexic snooty sorority girl, to Power Plant which is like that dude at the 24 hour Chinese buffet who doesn't appear to have moved from the booth in a month.

So choose your strain, and buy a notebook and an EC meter, and keep notes. Does the plant loo hungry? Write that down, along with the pH, EC, life stage, and room temps. Does it look burnt? Write that down too! Then review your notes and you will see how to feed the plant you are working with.