Maya your last post says it, its a pH issue on top of nute burn. The curling is from the pH and the tips are from the burn. (chicken manure is a nutrient ;) )
and yeah, they should be fine. its nothing major. some plants are nute sensitive compared to others. be sure to check the runoff of the pots to see what the pH coming out is like to get an idea on what the roots are sitting in.
Happy Growing and stay green!