Help?

So, I'm not into gardening or anything, but I've been keeping five indoor plants alive at work for three years. Two of them are peace lilies (one lady I work even brought he own peace lily in a few weeks ago because she had killed all but like one tiny leaf on it-it now has about ten leaves which are getting taller every day!) and they are in front of the same window, but one of them is several feet (the length of a bench) further back. The one in the front has 12 (!) blooms on it right now and the one in the back, while still very green and shiny and healthy looking, has no blooms. In fact, hasn't had any blooms in a couple of weeks. These two plants generally bloom throughout the seasons, although not usually as copiously as the slightly smaller one is right now. So, basically I'm wondering if anyone has any thoughts on why the second one is not blooming. Or why the first one is blooming so prolifically(I totally typed proliferately, but then thought that sounded weird, so I checked to see if it is a word and it would seem "ly" is not a viable attachment for proliferate. Sad. So I thought about proliferous, but when I checked to see if the meaning would be the same, it is not quite. Unfortunately, it took me that long to think of the word I was trying to think of in the beginning-prolific. I am a crappy nerd.).