My white anthurium had been sitting in the entrance way with frosted glass (and therefore receiving diffused light) from last June to this January (Northern hemisphere). It was doing perfectly fine until I noticed a few leaves falling off last week. I moved it out of the cold entranceway into the living room on a window by the radiator thinking it was reacting to the cold temperatures. I also lifted the pot out of its container and realised it was full of water - clearly I've overwatered it. The next day I noticed brown spots at the edges of some leaves so I moved it to the other end of he room, about 8 ft from the window. Today I can now see the leaves have yellowed almost immediately. Is it too far from light or is the overwatering responsible? I'm really concerned and wondering what I can do to rescue the plant?