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Once a day watering is likely too much. Watering at night is, also, a common cause for infection as well.

Combine these two issues and the plants are guaranteed to contract something.

I would suggest letting the soil dry down to about a half inch between watering. This will take a different amount of time depending on the environmental conditions at the time. Make sure to water during the early morning to avoid infection by means of sitting water overnight. The soil needs to stay slightly and consistently moist, but not wet. Drying down to a half inch will provide the correct balance.

You may need a fungicide to correct the issue. This article will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

This article will help you to grow the plant:

https://www.gardeningknowhow.com/ornamental/bulbs/siam-tulip/growing-siam-tulips.htm

That is a type of Curcuma! They are in the Ginger family, and the most notable variety is Turmeric. They will have the same care as Turmeric. This article will help:

http://www.gardeningknowhow.com/edible/herbs/turmeric/growing-turmeric-plants.htma