Brown leaf tips on my tomato seedlings

by Toni
(SE Wisconsin)

I have started quite a few tomato plants from seed. One variety, Mr. Wycle's, is starting to turn brown on the leaf tips. They are only about 3" tall and don't have their true leaves yet.

I have them in a greenhouse with a heater set at 65° and an oscillating fan. I don't feel I have over or under watered, what else could be wrong?

My other varieties are doing well. Thanks!

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