Im using fox farm trio with fox farms ocean forest potting mix. I'm growing 5 maui waui plants in 5 gallon pots under a 600W HID in a 4'x4'x7' space. Fox farms nutrient schedule is scheduled for stopping veg at 4 weeks. But with indoor growth I can stop at anytime. I plan on letting my plants reach 4'-5' and since pure sativas more often triple I plan to stop vegging at 18". What would be a good feeding schedule for my plants? How Long will the nutes in the soil last before I have to start feeding?