The Vanda limbatas grew so quickly, I had them in 50mm pots almost a week and a half after getting them and had them covered with a sheet of plastic for a further week as they obviously weren't in any distress.
Those in the trays you can acclimatise easily by opening the 3 vents bit by bit until all 3 vents were able to be left fully open by 2 weeks post potting.
As I have the humidity high at night (60%) using the oil filled Dimplex heater set on 2 1/2, even if our day temps are up in the 30s,(which they have been lately), and the floor very damp, I tend to leave the lids off over night.
Here in Adelaide the humidity in summer is usually between 5% to 15%.
When I open the GH up in the morning, (I have it encased in constructiuon grade insulation material over night) I spray the seedlings with a weak Seasol mix and put the lids back on otherwise they tend to dry out through the day.
I lost a few in the early days from dehydration, so learnt a valuable lesson very quickly, and tend to keep them on the damp side first thing in the morning. As they are on the top shelf they get a lot of sun which raises the temp and humidity inside the trays and the potting mix stays moister longer, as I close the vents to about a 1/4.
This is one of the good things about these covered seedling trays, is that you can control the venting depending on weather and atmospheric conditions.
You can read all that you can about raising seedlings, but, believe me, experience is the best teacher, as your situation is specific to you, and your propagation environment is again specific to you, and you learn very quickly how to adapt to problems that arise.
I also have bubble wrap "blinds" inside the GH (which I used during winter to keep the cold out) that I lower at night and spray them with the misting attachment on my gardening hose to again keep humidity up. The water gets trapped between the bubbles.
My GH is really set up as a warm house rather than a conventional GH as I purpose built it for tropical species, so that's why I have adapted the growing conditons the way I have.
The keikis on my Dens are growing faster than ever before I had the GH and the humid conditions.
