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Has anyone had any success germinating or completely growing in floral foam? I have found plans for a footlocker grow box that uses floral foam as the grow media, but so far i have not been able to get any seeds to sprout. I am wondering if it is the seeds or something i am doing. These are the...

I have a 70 watt hps light and i was wondering if i have to have a ground? It works without one but how safe is it without a ground?