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Leaving plants un watered for a week or two in no problem as long as the humidity in not too low. Sealing plants in a plastic box with high humidity for a week could easily go wrong.

What time release fertilizer do you use?

I fertilize every time I water except when I don't feel like mixing fertilizer. Simple and the plants don't care if I miss once in a while. You don't have to keep a schedule.😉

The photo detail is not sharp enough but it looks like mites to me. Have you looked it with a magnifying glass?

Previously yes. Currently no

Do you have a photo that gives size reference?

What is the flower size?

Two weeks of heavy cloud cover. 💤

I think you can safely leave them. I would reduce the light hours to 4 hours per day. Split the hours into two parts sunrise and sunset. Give them enough light to have some daylight metabolism but not enough to have much water demand. Make darkness be your Alli.

Are the little ones established and well rooted?

What will the humidity and temperature be during the two weeks?

When using lights at a constant output you have to consider the hours per day. How many hours per day are your lights on? As long as your foot candle rating isn't more intense than the leaves will tolerate with showing damage your not hurting the plants....just wasting electricity. 2500 foot...

No compots. I deflask into individual pots unless the seedlings are tiny. Tiny plants I'll plant 3-5 per pot or discard them.

These Phrags were deflasked and placed directly as shown. 12" under the lights.

Less than 500 foot candles.

Absolutely correct. The fungus is consuming something and the bi-products may be beneficial to the plant..... Or not.

That's why I asked if some kind of organic fertilizer or stimulant was applied.

Have you applied anything anything other than inorganic fertilizer? If it's only growing on the surface I'd spray it with alcohol.

I'm seeing positive results adding urea for my Phrags growing in leca.

Crispy dry should never happen. It's a new root killer for most orchids. What genera are you growing?