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What’s wrong with my tuberous begonia?

I am growing some tuberous begonias and one seems to be yellowing and the edge of the leaf seems almost dried up? I’ve been giving them morning sun and a bit of evening sun but shade during the middle of the day and have been watering them all together. You can see it is a bit more yellow than the others, natural variation or am I doing something wrong? Too much sun? Over watered? Under watered? Any ideas gratefully received.   
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