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i bought a 150 watt hps light and i was wondering how far do i need to put it away from a 30gal Rubbermaid container, i am doing bubbleponics i would also like to know how far when they are seedlings, sprouting, maturing and flowering ty for your help

do i need to use a water pump to distribute water to the plants or can i let them sit in water about a quarter of an inch and let the bubbles do the work aka do i need a root system hanging before i insert the pots please help and thank you.bongsmilie