From what I have gathered it is good to go slow when increasing nutes. I have erred in my first grow using Promix BX by waiting to long to start feeding the seedlings until they have been two full weeks above ground. They were in 5 gal pots that took 6+ days to dry enough for watering/feeding. That meant by alternating feedigs and waterings they only got fed twice while in the veg stage. The plants stunted but yielded respectable amounts of good medicine. For what it's worth I plan on starting at 10% for seedlings and will step up through 25% to 50% and may go higher if they tolerate it. In a soil-less mix you can flush them if you get too hot a nute mix. My ppm's range from 350-850 but could probably go higher. I have seen some plants that a friend grew with 100% feed, about 1450 ppm I think he said but he cautioned, "You got watch 'em." Take a look at the deficiency and over feeding pictures here in the forums and post what you are seeing for comments / suggestions.
Media (soil/organic or soil-less), container size and environmental factors like light & temp range & RH can all contribute to stressing the plants. Of course less stress > happy plants > good medicine. There really is an art to the science and the masters here are great at sharing their expertise. For me the best investment was in meters to measure feed/water pH, soil pH, and ppm's, max-min thermometer and relative humidity. Then I had some data to share with my questions.
In summary, if you know what to look for, you can feed them to tolerance and keep the pH in range to avoid nutrient lockouts, if you don't have tools or knowledge many good grow have been completed with 50% strength nutes in soil-less media. Best of luck TBB.
