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Even if you decide to ditch this plant, knowing the pH of your soil and your RH are pretty important factors... especially when trying to determine what might be causing problems like this plant has. Try to get the pH of the soil, like others have mentioned, and maybe think about picking up a decent hygrometer for your cab. Too dry or too humid air can play hell with the plants transpiration and ability to absorb and expel vital gases. I've got a digital thermometer/hygrometer that I picked up from my local hardware store, but until I got one of my own, I never realized that I was keeping the relative humidity way too low at times (10-20%). I was actually doing harm to the plants and slowing down their overall growth process.