I recently bought a Bromeliad, my very first. When I bought it, all of the purple stem thingy (I think it's called the Bract?) was a deep purple, and was starting to get some yellow flowers with green tips between the sections. Recently I've noticed the tips of the purples leaves have started going brown, and some of the flowers going brown and soft before blooming.

As you can tell, I'm not very knowledgeable about this new plant of mine, so any help is appreciated. I have been keeping the tank filled with rainwater, and I spray the leaves in the mornings. It has one pup forming and another just barely getting started off the momma. It is also in a southern facing window, so it gets several hours of indirect light but also a few hours of direct light.

My concern is obviously the browning tips, but also, I've had this plant for three weeks, and it hasn't seemed to open up at all.