Madagascan dragon plant looking sick

Hi everyone,
I was wondering if anyone could help me out with this problem with my dragon plant, its leaves are getting dried out white patches and then dying.

Any ideas and help which be much appreciated.
Kind regards
Fin

 

Stop watering it with tap water as that looks like flouride damage. They are particularly intolerant of it.
I would have it outdoors in a fairly shady spot too.

 

Looks like scorch to me, have you been spraying it in full sun?

 

No, it's in a well-lit porch by the front door so shouldn't be getting any scorch.

 

Thanks, I do water it with tap water. I also water my other Madagascan dragons, but they don't have the same problem. I only have tap water available.