I struggled with this in my change to hydro. What I'm doing now for seeds is germinating them in paper towels, moving them to jiffy pots with soil to get some mass and then I transfer them to the hydro setup. I successfully germinated a set of seeds in pea gravel using a dribbler setup but it's a patience robbing process making sure the seed is properly moistened and not jammed in the rocks so tight it won't open. It's easier to grow them a bit before putting them in the the hydro setup and they're easier to handle when they're bigger. You can put the tweezers away.