Hello - We have a ficus tree given to us by my FIL that he grew from a seedling and is now almost 40 years old! It’s been looking very rough over the past year with progressive loss of leaves and fullness. The leaves tend dry up and fall off, but it also drops healthy looking green leaves. There isn’t much natural light in the room so we have a grow light and try to rotate the plant regularly to provide even coverage. The lamp is on 9 hour daily timer. I’ve tried longer/shorter periods of light with varying intensities. It’s potted in a plastic container with drainage holes and there are rocks on top. I’ve tried more/less frequent watering intervals. I’ve tried misting the leaves. There is no direct air/heat on the plant. Any advice would be greatly appreciated to help rescue this old family tree! Thanks!