I was gifted this beautiful plant (I believe its a giant birds of paradise...?). I've had it for about two months now and its dying!! I thought at first that some of the leaves suffered from the truck ride over to my place, but its just getting worse! All of the leaves are splitting and the tips are all coming apart

What do I do?! I don't know how to trim it, I don't know what to add to the water.. I'm at a loss! The container has a water gauge to show that it has plenty of water and I don't turn my heater on, and its not near a vent.. what is happening?
[img]https://i1184.photobucket.com/albums/z338/littleconn1981/plant2-1.jpg[/img] [img]https://i1184.photobucket.com/albums/z338/littleconn1981/plant1.jpg[/img] [img]https://i1184.photobucket.com/albums/z338/littleconn1981/plant4.jpg[/img] [img]https://i1184.photobucket.com/albums/z338/littleconn1981/plant3.jpg[/img]