I need some help with my Peace Lily. I have had this plant for 2 years and when we bought it, it had some blooms that lasted for only a few weeks. After they died, I have only had one bloom that also died and I'm having another one now. The problem that I'm having is that the leaves are turning yellow and some have brown tips. I water it only when the pot feels too light or when after putting my finger in the dirt it feels dry. When it comes to light it is one feet from a north window that it's not wide open. I have the feeling that it needs repotting. It is in a 4" plastic container and it sure looks crowded. I bought a 12" plastic pot, but by reading about repotting, I believe 12" would be too big. Please advice on what to do. I want to save my peace lily.