First 2x2x4 grow tent

Firstly could be that you need nutes seeing you said you haven't fed them yet but I noticed you have an opening down by the base of the plants, is that an intake? Because if so I had to block the air from directly hitting my fabric pots as it was drying the roots out in one area! If not that then maybe a slight over watering gromie! But all in all your grow looks amazing 👊🏽👊🏽💯 and if you can try and get your corner fan above canopy or maybe back facing so the air comes off the walls and around your plants rather than directly at my g

Yes bro, feed her, she wants food and especially in bloom she requires alot of calcium and magnesium! If after your first bloom feed she doesn't return to a healthy green then look at adding iron! But honestly as soon as they hit bloom the uptake goes crazy! She just looks like she's in need of a feed honestly

Blueberry muffin can have an extremely short flowering period.. like 45 days I believe to 60. Be aware that amber trichs can be from physical damage so if you se clusters of amber if could be from hitting itself from wind movement. It’s likely that you have an early finisher tho.