Blooming Idiot

This is day 29. I am only using the veg light. About 235w. First time grower. Starting with only 3 plants. I am already planning on buying another set-up and have a veg tent and a flower tent. I haven't started using any nutrients . I give the girls about a half gallon of water every 3 days. I dont want to over water. I am trying to keep my day time temp around 77-79 degrees and the RH around 45-50%. I started with a RH of around 70% reduced to current level about 10 days ago. Im on an 18/6 light schedule. Because of limited space on the floor of the 3'x3' tent I built a hanging shelve to hold the all the equipment needed.and I am already planning on increasing production on my next grow. I figured I'll start small with my first grow. Im hoping I can grow 6 plants in the 3'x3'.Already ordered more seeds. Debating whether to stay with fabric pots or use 5 gallon buckets. I'm growing in 5 gallon fabric pots. I use a 5 stage RO filter and I ph my water between 6.3 - 6.8. I dont try to keep the exact ph each watering.