Please be sure you aren't overwatering, too. * A fingertip pushed into the soil should tell you if there is water beneath. If the soil feels damp, don't water that day. *Once every two days sounds like it might be too frequent, but I am basing that on my climate here and the kind of temperatures you are talking about. *
Indoors, the heating and cooling can be very drying on the air, though. *
. *A grow light on a timer could also be helpful. *Ask Soildoc he has a lot of indoor trees, I think.
Good luck!