I'm going to start getting supplies for my first grow. Id like to buy FF Ocean Forest. But I don't have a hydro store around here. I found a 1.5 cu ft bag of it on Amazon for 40 bucks. I'm going to be growing 3 plants and my final pot is probably going to be 3 gallons. Will 1.5 cu ft of soil be enough for all 3 pots?