My Euphorbia Ammak has turned brown along it's edges on one side and also has two little arms that seem to be rotting. We had it in the corner of a room and I have since moved up against a Western facing window to get more light. I haven't been watering much so don't think it could be caused by that. Wondering if maybe it got burned when we had outside one day? Should I remove the two soft, now fully brown arms? Or, will they naturally fall off? Any other suggestions for how to repair the damage?