I got a small Neil's "Canada" last summer. It was planted in a very light mostly perlite mix. I repotted it immediately scraping off some of the perlite. I use a 3 parts milled sphagnum peat moss, 2 parts vermiculite, and 2 parts perlite for my streps.
The plant seemed happy at first and then the burned leaves appeared. More leaves formed and the burning continued on the old and new leaves. I finally sent Dale Martens a picture and asked her what she thought the problem could be. She said "It looks like necrotic tissue from drying out once too often. But if that were not the case, if it were mine, I'd get rid of it. Sometimes due to the genetics of a strep, it doesn't cooperate in whatever conditions are ok for the other streps that grow near it."
I really like the plant and would hate to throw it out so I wicked it and now new leaves are forming and only one tip of a leaf has any burned tip. Apparently, that particular plant doesn't like to dry out.
Article and photo done by Sharon J. Thanks and please comment on the post!