That's what I think too. The brown leaf can't turn green again, plant would look better if you take that off, but glad you left it on for the pic to show what's going on. Looks like it has a toxic buildup of something in the soil, likely fluoride, to which this plant is very sensitive. Over time, some tap water can alter the PH of the soil also. Has it ever been repotted? The next time it's dry, I would flush the soil with a gallon of distilled (not bottled drinking water) or rain water if possible. Pour about 1/4 of the gallon on it, wait 15 minutes, pour another quart. Wait 15 minutes, then very slowly pour the last half gallon, all over the surface of the soil, not just in one spot. Then let it dry well before watering again. It likes very bright shade, but not much if any direct sun outside. In the house, some direct sun that's not during the middle of the day should be fine. Come on by the house plant forum if you have further questions or need instructions on repotting, best done during summer.

you guys are awful gracious .. to flip back and forth and back and forth.. and back and forth .. like you dont have anything better to do .... see link ... and it is much easier.. for us lazy peeps.. if you want my effort [for whatever it is worth .. lol] .. that you go to the effort of learning how to paste the pix right here in the post ... ken Here is a link that might be useful: link

Hi the one on the left looks like a Philodendron and if not then it is a Monstera deliciosa, do a Google on them and you may be able to see which one it is. I have a few growing and they grow huge just how big is that reptile enclosure it sure looks good. The one on the right is a Fan Palm once again it grows a big fan also. How long has those plants been in that enclosure do you know. I hope this has been a little help if not someone else will let you know if Iam wrong ...Cheers..MM.

Tall ones look a lot like 4 o'clocks (mirabilis) - on the right front looks like something in the nightshade family...