Nothing to worry about, it looks to me as damage caused by rubbing against the fabric pot when your fan is going. No need to stress, growing 100% perfect plants with 100% perfect leaves, 100% of the time, is not achievable. You are on a journey of discovery and on the path of constant learning. Each grow will get easier, but little mistakes, which everyone makes, will teach you what not to do in the future. Like most things in life, it is not about what to do, but about what not to do. Your plants look healthy and happy and you should be excited at the thought of finally having some home grown stash, made with your very own knowledge and total quality control over what your plants are receiving throughout their life cycle. Hope this helps.... Organoman.
PS - try leaving your healthy leaves alone. They are making all the energy for your plant to grow its best. Removing healthy leaves reduces your plants ability to make this magical "grow energy". I recommend only removing leaves once they have gone a yellow colour, by then they have fully served their function.
Good luck and happy growing.