UPDATE:
They are almost 4 weeks old now. Well, the biggest ones are, the smaller ones are about nearly 3 weeks. I have had some problems with soil and heat/low-moisture stress, so some leaves look like canoes. I mistakenly bought a soil which was fortified. I flushed the buckets last week to get rid of some of the nutes since I didn't know what was actually in it. I gave them their 1st feed yesterday of 1/4 strength and small bit of epsom salt; they seemed to be Mg deficient, but it's hard to say since it could be heat stress or nute burn. Anyway, I hope my babies will pull through and get healthier.
P.S. I have only one extractor ducting, and everyone was saying: when you have only one vent, it must be output. So I had it that way, but it was getting dry and hot in the room while outside it's always wet and cold. So I said to myself fuck it, and I reversed the fans so it draws in outside air, and left the door a little open. I don't care it it smells in the house. I might put be back in flowering, but in vegging I need more moisture and colder air when the lamp is on 18/6 as it heats up the whole room.