thank you, the experts have told me it's a lack of light, and I just found out I have the WRONG light entirely so I ordered another. I think if it has adequate light it would stay red.... also hoping by getting the right light it can return to a more red color.

oh you said brown... I was thinking green. The red one of mine is turning green, but the underside is going a little brown, and I am assuming it also has to do with improper light and just not thriving.