hi recently started growing again after a 3 yr break, im using mg soil with pre-added nutes mixed with 25% perlite. the seeds are arjans straberry haze. fresh air is a problem so am using a vat of yeast sugar and water to supplement the air. light is a 400w hps and the temp is holding steady at 82 degrees. could anybody tell me when i should start to add fertilizer or if i should at all?