Nice man, they look super good for just finishing the fourth week! Get the feeling it's going to be another biiiiig harvest lol. I should have gone with the 5x5 for my flower tent... lol. Your veg plants look nice and healthy too. I'm finding 6 to be a bit more time, work and mixing than 1 was, and I'm not even really feeding the little ones yet lol.
Stay clean lol, have a great day man, happy growing! Also, you don't need tips, leave us more haha