My autos have sprouted and doing well one stretched to much and has died lol
Anyway when shall I start feeding them? Should I water them every other day and feed them every second water?
Don't water every day. Wait until the soil is dry to the touch. If you push your finger down into the soil and it feels dry then water. I water every other day.
I started feeding after two weeks but I'd say you could get away with waiting 3 or 4 weeks. My autos seemed too sensitive at 2 weeks. I was told 2 weeks but next time I'm going to wait 3 for some and 4 weeks for others to see which one the plants respond to better. I do know that two weeks is too early, though.
Also, remember not to use the nutes at full strength. If you water with tap water allow the water to stand for 24 hours to dissipate all the chlorine. I put 3 gallons of water in a 5 gallon bucket. Allow to sit out all night then in the morning I mix in my nutes at 1/4 the strength and then I let the water still all day. At night I use that water to feed.
I've been doing this schedule. Water then skip a day, feed then skip a day, feed then skip a day, water then skip a day. So water, no, feed, no, feed, no, water... and so on.