Nice plants! There is an entire semi-hydroponics forum here. You can browse it to learn a lot. From the left menu, select Forums, then scroll down until you find it. The inventor of S/H posts here with the username Ray.
I have a lot of plants in S/H.
The time to move a given plant to S/H is when it is just beginning to make new roots. This is because old roots are not adapted to S/H, and usually die quickly after the move. Unless the plant is actively making roots during the move, you may wind up with a plant with no roots. Many will eventually survive and grow, but they may be set back for many months, to over a year.
Also, there is more evaporation from a S/H container, so the root ball tends to be cooler. For this reason it is a good idea to do the move during very warm weather, or use a heat mat under the plants while they are getting established in S/H.
Because of these factors, it is rarely a good idea to move an entire collection to S/H at the same time.
I might suggest you pick one or two plants and move them. Learn how to grow using S/H in your conditions. Then, if you like it, you can move more and more plants to S/H at the appropriate time for them.
Phalaenopsis and Paphiopedilum tend to do very well in S/H. They usually take off and continue growing as though nothing happened. Cattleyas are more tricky. Even if moved while making new roots, I sometimes have them sulk for months after the move.
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