Hi everyone, I mentioned somewhere in the forum that I started orchid flasking. In less than 3 weeks my Rhy gigantea started germinating I was so so happy about that but lately I see some of the protocorms are turning yellow. I'm very concerned, I don't want to lose them. What should I do to save them.

The glove box stays 78 drgrees, 24/7. Behind the glove box I have a T8 flourescent grow light which is ON ALL THE TIME and at night there's a second grow light that we turned on hoping it will help the chrolophyll. The media was bought from one of the well known orchid growers. Pleases help, Is there too much light or is it too warm all the time? What did I do wrong?
Edit:
Hi, can anyone tell me how to upload a picture here, pls :-)