Overfeeding for sure. Measuring the EC of your runoff helps with this. If the EC in your runoff is going up after each feed, them you're probably giving too much nutes. In this case the dark green foliage is a classic sign of too much N, but it looks like you have other toxicities as well. Almost never trust the feeding schedule on the bottle. Always start at 1/4 and slowly increase it. You'll rarely need to go past half strength in my experience.