Hydroponics first grow

Hey guys got my seeds(look amazing), did the paper towel method to have them sprot, im than going to put them in rockwool,*how long till they go into the buckets with grow medium (using a ebb and flow). This is where i get confused. 1) What type of feed time should i start. It takes about 15 min to fill the buckets to the point where itll be just a inch under the middle section for the rockwool to sit on. It takes about 40 min to pump the water out (small pump) i have a 600w led light and a 600w HID lamp on the side incase they need more light. 2) When do i add nutrients to the water.

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