Thanks so much for the detailed help! The shoot is now almost 5" long, and looks very healthy and happy. In the last two years it has bloomed beautifully in its west facing window with very little direct sun, so I'll keep it there for now. I'm using very weak solution of 19-31-17 by Schultz. Thanks for the flushing out every other time idea. I've had good luck with my orchids, but I have LOTS to learn!
Happy Spring!