cant find the exact fert, and i think i left it at the old place when i moved, but something similar to this:
Miracle-Gro® LiquaFeed® Tomato, Fruit, and Vegetables Plant Food - Scotts Miracle-Gro
it came with a measuring spoon that you screw on to the bottle and the mxing instructions were 2 spoonfuls per gallon so for 4 gallons, i did 8 spoonfuls.
i went down to a local hydroponics shop and told them about it, and they said it was most likely chemical burn due to using a fert meant for soil for buffering qualities in a hydro set up. they had me get a quart of botanicare aquashield and gave me some general hydroponics florabloom with mixing instructions of 2 tsp fert and 1 tbs aquashield per gallon (although the bottle of aquashield says 1-3 tsp per gallon, i think the email she sent me may have been a typo. i am currently using 2 tsp per gallon) until it comes back, then go to the proper mixing. i am only using 3 gallons of water at the moment.