Lotus seedling leaf-what's happening?

Saluda, SC(Zone 8a)

I have adventured into trying to grow lotus from seeds. Everything seemed to be going well on this plant which was transplanted into a tub 7/23. The plant is sending up a new leaf every few days. Suddenly the oldest leaf developed a dark spot that has spread into this.

Experienced lotus growers, what is happening? Am I likely to lose this plant?

The tub is in full sun.

Thumbnail by gessieviolet

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