When will the Anthuriums bloom?

My friend gave me four parent stalks four months ago and so far they're fairing well in the new location. However, this morning, I've found several leaves going yellow though. This is my first attempt of potted gardening (as we really don't have a garden plot or a big-sized lawn) so I've contented myself with this set up. I'm just starting to learn some Anthurium facts: 

Anthurium growth and anthurium flowering

Houseplant Care Tips

and wish the plants would show any flowers soon too just like the ones in the pictures here.

Soooo, the possible reasons for the yellowing leaves are that I've either watered them too much and soil content may be lacking nutrients. I may have to find also a shadier spot for them too.