Get that light closer, and yes, you will need more than that soon. How many W is that bulb there?

Seperate those 2 plants in the same pot right away, otherwise their roots will get tangled below, and both plants will not make it very far in life. Put each plant in its own pot, ignore this reply, and I bet I see thread in a months time..."what's wrong with my plants?!"

Get foil (use dull side out) or white mylar on your walls. Darkish walls just absorb the light. You are losing a lot of good light not doing that.