Sequoia, dawn and coastal redwood saplings dying

My redwoods are all dying. Most of them are 1.5 years old, are in a greenhouse ranging from 35-90% humidity in Dallas, TX, and get watered every 1-3 days. The sequoias were the ones who got ixneyed first, with a white substance showing up near the base of the trunk. Now the older dawn and coastal redwoods are showing signs of strain, with the branches starting to droop and the edges of needles yellowing. I can give you details about soil, etc if you need more info. Please help, it would be incredibly frustrating to lose all of my work on these things. Progression of different plants as of 2 weeks ago. The older dawn/coastals are about a foot tall now. Can provide pics.

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