Mature Fiddle Leaf Fig is struggling. I purchased the tree in late october and
one of the three stalks already had some yellowing in the veins. In the first month or so, two interior leaves
turned yellow/brown spots and dropped. They were
small and hidden.

I am now developing some yellow veins in all the plants
along with brown spots. The leaves are
turning yellow fastest around the brown spots.
Mostly around the middle height of the plant.

The leaves at the top are bright green and soft.
The leaves from the bottom up are dry/brittle and could crack if bent too much.

I am watering about every other week and about 2-2.5 gallons,
enough for water to start running out the bottom. I used a hygrometer to test
around the roots before watering and wait till it says it’s getting dry. There is about 2-3 inches of Styrofoam packing peanuts at the bottom for drainage with a layer of Vigoro Polyethylene Weed Barrier fabric on top of them.

I repotted it in a 18x18x20 inch synthetic pot, the soil I used
is a mixture of miracle grown regular/moisture balance/cactus soil with plenty
of vermiculite. I might have added a
little miracle grow bloom feed an early watering but it wouldn’t have been much
at all.

It was getting a lot of light the first couple month but I have
since been closing the blinds. The room
still gets pretty good sun in the winter.

Room temp doesn’t get below 65*, humidity is pretty good and
I was misting with the dry winter air.
I completely closed the air vent near it and the door does not have a
draft.

Photos 1 & 2 are from December.

The rest of these photos are from 1/23/18

thanks in advance!