Aerangis punctata dropping leaves-HELP

[moonsful]

I have this plant now for a couple of months and at first only the grown leaves were falling but now its the new ones as well. They just turn pink/ red on the edges and fall off. The plant is mounted in some kind of a metal mesh sponge which it was in since me buying it and it hangs in this vase that has water in the bottom for humidity but it never reaches the plant. I soak it in water every couple of days and i let it dry between waterings. Any advice on what im doing wrong?