Anthuriums actually dont need a lot of water, so letting them dry out between waterings can't be hurting that much. Sounds like it has the right amount of sun...
When i was moving a few months ago, my anthurium was accidently misplaced and left behind, and turned sickly like you described. When i brought it back, i stuck it with my other full sun tropical
plants infront of my non-shaded south window... it got even worse

I then moved it to a shaded bright light area of the house, and its begining to pick up a little again.