It is a Phalaenopsis Hybrid orchid. The ancestors come from tropical places where they grow/grew on trees or rocks, the roots are largely exposed to air.

Needs warmth, moderate humidity, and the roots must get wet and dry a little.

The leaves store moisture and the size of the leaves give a clue about the amount of light needed.

Temperature range 60 to 90 F.

Find some complete culture notes written for where you are the USA and read some of the many past threads on Phalaenopsis culture.

Added via edit. Pic. of Phalaenopsis growing in a vase method above water in base of vase. Phalaenopsis pot in vase above water.

Phals roots will grow suited to the environment they are in. The roots grown in bark will die off when place in water. New roots will grow suited to water but those would die if you moved them back to bark.

Timing of when you re pot is important. Typically it is done in spring just before new growth begins. Re potting is always stressful on the plant and it is fairly common for a plant to shut down growth when there is a change in environment. My guess is that the new growth was based on timing and not the switch to water culture. If you had waited a little longer I think it would have started to grow again in the pot.

What to do now is the question. Moving back and forth will continue to stress the plant. Whichever way you go, don't remove the plant from the pot any more

I decided to switch it back to a pot and I picked a ceramic one with drainage holes that has a wide enough mouth to support the leaves. I will leave it alone now!! How often does a Phal need to be repotted in fresh potting mix?

that was my trouble... The roots weren't holding the plant secure in a small pot (like people were telling me it needs), and the plant was falling over almost out of the pot. I potted it in miracle grow orchid potting mix. Is this ok?

It does have long large leaves... Should I move it to a shaded south window?

Thank you both for your help!

This is a very healthy looking Phal joyfulsu, and believe she will do just fine!

I've never personally used Miracle Grow potting mix, but have read on the forum the bark in this product is too small for Orchid roots. If you want to keep it in a bark mix, I suggest Better-Gro Orchid Mix, which I've had success with.

Certainly put some good thought in the media you want to keep her in....repotting can be very stressful for the plant.

Definitely move it to a south-facing window, even southeast or southwest.

If you find the weight of the plant is causing it to topple out of the pot, you can tie it in until it has established enough roots to hold itself in place. Or you can use those big fat rubber bands you get on your produce at the grocery. Just hook it across one of the leaves.

I know roots tend to sulk when they are repotted, and going from moss to bark tends to be rough on a phal ... but I keep seeing "all of the roots will die if you move from one growing method to another" repeated quite often in different places, and that's just not true. I have successfully moved plants from mounts and sphagnum moss to bark with little trouble. Do I lose some roots? Heck yeah. Sometimes the next leaf that grows is kind of pitiful. But then it becomes acclimated, and the growth begins again ... certainly not from scratch, but from the roots that weathered the upset of being repotted.

Thank you all so much! I was just given another phal orchid that has not been repotted in probably two years or More. should I wait until it's done blooming to repot it?

Also, I have never seen roots quite like this... Is it reaching toward the light??