is this a red Spider?

[tim_r95]

So I saw a really awesome orchid at the store yesterday and I just had to have it. From what I can tell it's a red Spider? The put it was in was like extremely small so yesterday I went and got some orchid mix and repotted it into a bigger orchid style pot. It was in a 4 inch plastic pot. All the roots looked very healthy but we're extremely clumped up and the pot was filled almost entirely with roots. What I would like to know is what is a good orchid fertilizer to use? And if I am taking good care of it so far? I have it on the desk in my room ,which stays warm and humid because of my fish tank, next to a West facing Window with the blinds mostly closed so the light is filtered.