For that light to penetrate those gorgeous silky green fan leaves at the top got to go..1 Blurple of that size 20 inch or so does like 2 flowering plants, lights usually flower 50% less then their maximum capability IN Veg,for me its always been every 2x2 space 3 plants.. more plants isn't better if you can't provide them all light especially in flower
For that light to penetrate those gorgeous silky green fan leaves at the top got to go..1 Blurple of that size 20 inch or so does like 2 flowering plants, lights usually flower 50% less then their maximum capability IN Veg,for me its always been every 2x2 space 3 plants.. more plants isn't better if you can't provide them all light especially in flower