what a spectacular birthday gift!!!
seems like you got a spike forming! however the degree of the yellowing of the leaves worries me a bit. what media is underneath those gravels? sphag moss?? can you see the condition of the roots since it is in a white plastic pot? if cannot i would carefully remove the plant out from the pot to check the roots, should not harm the development of the spike if done properly. if the roots are ok, then i would water the media when it is totally dry (assuming it is sphag moss down there).
if there is problematic roots down there, i guess you would need to do some trimming then
hope all the roots are ok and you would be having your belated birthday wish from the black pearl about 6-8 weeks later =)