Paph. delenatii Bloomed

[quiltergal]

Pat, you'll have to wait until next winter for my next bloom on this one.

I do have a couple of questions for you since you seem to know a lot about Paphs and delenatii in particular. When this plant bloomed it had two buds. Just as the second bud was opening the petals and sepals on the first flower started to turn brown. It had been blooming for about 2 weeks. As soon as the second one was fully open the first one dropped. I'm not sure how long the flowers are supposed to last, but that seemed kind of a short bloom time to me. Is this normal or am I doing something wrong culturally? It's on the top shelf of my rack in relatively bright light. Gets watered twice a week. Once with 125 ppm N MSU, and once with tap water.

Thanks for your help!