Pale face could be due to the molt and heat, same with their droppings.
I would pick up the birds, gently right now, and check their weights and muscle/flesh. are they thin?
next, I would go out at night, scoop up some poop, lay it out on cardboard and dig through it. Any worms in the droppings?
are they active and healthy looking?
I would not worm unless necessary. Most worm too much or when not needed. Wormers are toxic, and should only be used when necessary.
I hope that helps.
Ps: I have not needed to worm my birds in years (maybe 10 + years)