The picture is very blurry. but I do notice that the leaves are curling. This us due to excess water. Basil may not be very happy in your environment. The leaves also look a bit yellow, which is also an over watering issue. Adding a small amoint of iron may help to reduce this. Black leaves means they are dieing. When fresh basil is ground up very fine, it can have a blackish color. When posting Photobucket pictures here, use the HTML link instead of te one you pasted in above. The link will bring up the photo here instead of the text you have in your post. Check for spider mites too. If holes are in leaves, you may want to try a spray of neem to reduce any future insect damages. The fertilzer your using seems to be a bit high, is it just chemicals? Plants are not just needing NPK, but aso many minerals and micronutrients.

did you get water on the leaves?that will some times make them brown... and how long have you been growing it

You didn't say how often nor at what strength you are fertilizing (how many ppm of nitrogen). Size and age of plant? Are you checking the oxygen/pH level in your water? Hydroponics present different issues than traditional container growing. Doesn't appear to be a disease from the picture. Yellowing could be a nutrient issue. Spots could be insect damage.

How close are the top leaves to your grow lights, could it be burning?