Hi all,
I'd just put them in a place with subdued lighting (N. facing window?) , and they should be fine. If you think of them like (propagating) garden plants from soft-wood cuttings you won't go far wrong.
Thirty years ago I worked for a large nursery and they were looking at tissue cultured Roses, but it ended up as a commercial non-starter because the tricky bit was the weaning from flask to compost, and losses were much too high.
It should be easier to go from flask to a wet environment, but I can see the advantages for the companies that produce "in vitro" plants if the transition from flask to pot/tank was after the plant had been purchased.
All though it sounds strange there is usually much less profit in growing a larger plant and selling it for more money, as against selling younger plants more frequently, there is even a term for it "growing out of profit".
cheers Darrel