Its to high.

What are you using for substrate? If may be because you added some new moist substrate and it just needs a few days to dry out.

If that's not it and it is remaining high you may need to add some holes to the tubs. This can be done with a drill or soldering iron.

Also increasing the air flow in the room can drop it. This can be done by adding a fan on the other side of the room. Do not point it directly at it.