If you look at the pics of RG #3, its having some ...

Hey there! It's is kinda let it take it's course but there are some things you can do. The first most important is make sure it is not getting to much water and they shouldn't need much nutes either at this stage if any at all. At least that one You should only give it plain pH'd water for now it is working on growing its' roots right now that's why there's not much upward growth. The best way to make sure you are not giving to much water is to let it dry out almost completely but not to where the plant wilts. then feel the weight of the pot take a mental note of it or if you feel like it you can actually weigh it. then when you water feel the weight and same thing make a mental of literal note of it. Now you can know if it needs water by the weight if it's not as light as it was when dry then don't water if it is water. Oh yea and when you do feed you might want to try a Feed-water-water-feed schedule. Happy Growing!🙏