The last pic of your bad ones you said it didn't open .I am very upset if this happens to me. My Anthuriums some times wont open the flower. I am sad. I think it happen here due to fungus. In your case I think bec it is in the tank and not enough air.
I provide ventilation with a small fan attached to the screen wall I added. This exchanges the air so that all is dry in the night. Thanks for looking.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Tin, would you like to come visit and build me one of these? I could use a second orchidarium in addition to the orchidarium I am purchasing, I wish there was a way I could make it look natural inside, but I lack that kind of creativity.
Great job!