Den. Enobi Purple Splash yellow leaves

[OrchidGroupie]

Hello everyone,

I purchased this Den. Enobi Purple Splash 3 days ago. It was healthy, 2 open blooms and a 3rd bloom opening slowly. Now there are yellowing leaves and there are 3 leaves that look like they are mottled with yellowing starting.

The room it's in is bright, temps are above 80 and humidity between 62-82. I kept it in the original potting and watered. Initially I placed it on a shelf with a T5 lamp hanging 2.5 feet above it and some other plants. When it starting yellowing, I thought too much light so I moved to a southwest win shaded by a curtain but near the previous location for its bright light. The room has 3 aquariums in it so the room stays humid. I have a small fan blowing nearby.

This is the 2nd time I bought this plant and it yellowed the same way. I can't seem to keep dens at all.

Any feedback is welcome.