Burning of the leaves because of too much difference in temperature at day or at night
The present temperature difference between day and night may cause some difficulties. At day temperature may go up to 30 degrees centigrade, while temperature at night may be only 17 degrees centigrade.
Through this, plants have to evaporate too much moisture in too little time when facing day temperature. This may cause so called burning tops. Leafs will show dry brown edges (or they get all brown) and they curl.
New tops will grow, but it will slow down the growing process enormously. It probably takes you several weeks more before you can harvest.
The maximum difference between day and night temperature must only be about 5 degrees centigrade. So it is advised to heaten up a little at night.