First Grow! Test run

From the looks of the plant and the diary info it seems like a Phosphorous (P) toxicity! - Green-Dark green coloration while bottom leaves develop a tip burn (chlorosis) with no yellowing. This may also cause Iron (Fe) and Zinc (Zn) deficiencies but at this early stage it's very unlikely. As you mentioned in the diary the toxicity is probably from the "Big Bloom" fertilizer you added, at this early stage of the growth your plant is quite sensitive to those nutrients and too much can easily harm them especially phosphorous which is needed in smaller amounts during veg. Try watering with at least 20-30% runoff and reduce the "bloom" fertilizer by about 30-50% and check for improvement daily, if it gets better then slowly increase as the plant matures but if not then reduce by another 20% every 2-3 days until improvement is visible. *As always I recommend people use about 1/5-1/4 of recommended fertilizer dosage at early stages of growth with slow increase as the plant matures - it is a lot easier on the plant and you to fix deficiencies rather than toxicities. Hope this helps! Good luck and happy growing :)