Thanks everyone for all the helpful suggestions. Here's what I've done.
Wednesday after reading Elaine's post about Epson Salts I mixed some up in a small watering can and watered it with that. Yesterday and today I've set it out in the sun as soon as the temperature rose into the 40s I also watered it really well this morning. At night of course it will go back into the greenhouse with the heater. I noticed that not all the leaves have the reddish tint just some of the larger ones at the top of the plant.
