ask PHS

The Ficus tree does best with morning sun light, and never hot direct sun from a south window. You may be a little low on sunlight in the north window, but it may be worth a try. I am hopeful that the Ficus will do well as you say your succulents are doing well and we all know most of them love sun. The lights you say you leave on 24 hours a day may not be helping too much as plants need light from certain areas of the light spectrum that light bulb lights don’t usually have in great supply, if at all. I am hopeful that maybe the lights you have turned on are fluorescent lights as they do have some of the light spectrum plants need, depending on what kind of fluorescent lights you have.  

If you have had a Ficus plant  before, you probably know that one of the tricks of growing them is the watering. They want to dry out before watering. Too much water causes leaf drop, as will not enough water but if the plant is dry, it will tell you by drooping. Do not let the plant get that dry!!  A safe way to know when to water is to stick your finger in the pot down 2 inches.  If the soil is dry that far down, it is time to water.  Water well until water is coming out of the bottom, then withhold water until it is dry 2 inches down in the soil. 

You also are interested in a Corn Plant, Dracaena.  The Corn Plant may be a little less demanding, but it is a close call.  Bright, indirect light is what it likes. How bright your north window is depends on whether there are heavy trees blocking some of the brightness, or if maybe the window is tilted a little northeast or northwest so that a little more light creeps in….I am hoping!!  It too resents overwatering and a check with your fingers for dryness and inch or so down is true for this plant too.  I suspect the Dracaena might be a safer plant for your room, but as I said above, it is a close call!!

Thank you for asking the Pennsylvania Horticulture Society your question.