Hi I purchased this fiddle leaf tree at Home Depot for $100 and I love it shortly after buying it the leafs started to go brown. I moved the plant to a sunny window a week after getting it and water it once a week. It may have been sick from the store already there was a brown leaf or two when we bought it but then the brown started to spread after we purchased. There is still a lot of healthy leaves on the tree. Can you give me some suggestions as to what might be wrong with my plan as well as what I can do to make my plant better.