Hi,
After studying and researching a lot about Hydroponic fodder cultivation I have come to a conclution that for growing fodder you will not require any kind of nutrients solution for first 11-12 days as all the nutrients a grass needs are stored in the seed it self, even if you give extra nutrients it will be wastage of money, but do remember to feed the grass to the animal within 8th to 9th day as after that these grasses will turn bitter and your animal may reject it. For me I am not giving anything extra just seed and water.