Hi Junebug, I see a couple of problems.
If your tank is glass bottomed, you may have put too much weight into your tank. The bottom may eventually crack under the weight of all the rocks, plus wet soil plus plants. You didn't need such thick layers of stuff under the soil. A much lighter drainage solution is to cut a piece of plastic ceiling light screen to fit the bottom, and over it place a piece of water-permeable landscape fabric. Over this you can put the soil mix.
Jewel orchids don't really grow in soil. They grow in loose leaf litter lying on top of the soil. Their thread-like roots are easy to suffocate with soil. A lot of gesneriads are like this, too. They need very high humidity and just barely damp medium. In a well-sealed terrarium they might only need watering a few times a year. They crawl over and send their roots into the loose material. Sphagnum moss also works well. The plants might do better if you lay them sideways, and just barely cover the roots with moss. The stems will root and the plants will grow horizontally.
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