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howsit people....i'm hoping to grow 5 great white sharks under 400watt hps light and my soil mix is potting soil, pre mix, perlite and worm castings. So my Q is would that soil do me from start to finish or do i need to add fertilizer and if so what do u recommend? And how many oz could i get...

howsit people....i'm hoping to grow 5 great white sharks under 400watt hps light and my soil mix is potting soil, pre mix, perlite and worm castings. So my Q is would that soil do me from start to finish or do i need to add fertilizer and if so what do u recommend? And how many oz could i get...