Nepenthes pebble tray

Hey everyone,

My nepenthes albomarginata is growing pitchers but was not showing significant growth in the first month of bringing him home.

I decided that the humidity was too low as he gets 3-5 hours dialy of direct light and a few hours indirect. My sister made a pebble tray with a section for pebbles and some for moss. I told her not to make one but she did anyway.

I was wondering if this pebble+moss tray will do anything for the plant?