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Brown leaf tips

The tips of some of my Moneymaker Tomato and my Chilli seedlings are turning brown. They are potted on in 3 inch pots in a cool greenhouse. I usually water them from a water butt. Any ideas what's wrong?
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Maybe a bit early to have them unheated.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
Could be. The temperature swings from quite cold at night to over 100F during the day. I suppose I need some technology!