Because it's a waste of hydroton. Do you just have plants sitting in hydroton in your table with no pots or rockwool?why shouldn't i do this other than the obivous reason of the hydroton getting stuck in the flood/drain hole
If your plants are just loose, and you get males... you're screwed. Pulling the males means you'll leave little pieces of roots behind/they'll be tangled with your girls. Then these roots will decay welcoming nasty pathogens you don't want anywhere near your roots. Get them in individual spaces/containers.Because it's a waste of hydroton. Do you just have plants sitting in hydroton in your table with no pots or rockwool?