Trident maple clump

My trident maple clump with five trees has three of the trees with yellowing leaves and the other two are green and healthy looking. They have been in this box a year now, and trunks seem to be fusing nicely. Soil ph is around 7. I water them morning and night, and still drains well. Any advise is greatly appreciated thanks

Is the social drying out before you water?

Or is it staying too wet? I am only watering once a day and have some tridents in much less soil.

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It may be staying to wet. It dose drain slower than the rest of my trees

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If you feel it is a balance of water and oxygen issue, the beauty of a wooden box is you can drill holes in the side to create aeration.

The bottom could also be peppered with small holes to increase drainage.

Just a random thought, I use mainly mica pots or plastic cement mixing trays because if I have an issue before I repot, I reach for the drill first.