Q.My Bromeliad plant
My plant is a gift, I have had it about 6 months. It is about 2 1/2 ft. tall and has always had a gorgeous red top of about 12 inches. In the last couple of weeks, the top 4-6 inches is turning a lighter colour (slightly beige). Is this normal or am I doing something wrong? I keep it in a south facing window, which has a curtain 1/2 way up so it does not get direct sun. I water it as told by the florist. Any suggestions or help would be greatly appreciated.

Your plant may be starting to enter the last of it's growing cycle.
These plants are generally won't grow more than a year indoors. With luck your plant will grow pups that you can propagate into new plants.
Here are a few links for you to refresh you on the care and life cycle of Bromelaid plants.
https://www.gardeningknowhow.com/houseplants/bromeliad/growing-bromeliad-plants.htm
https://www.gardeningknowhow.com/houseplants/bromeliad/watering-bromeliads.htm
https://www.gardeningknowhow.com/houseplants/bromeliad/getting-bromeliads-to-bloom.htm