That’s N deficiency for sure. The fish meal should get you back in shape. Some of the brighter yellow leaves are going to drop but the slightly yellow stuff will most likely repair throughout this week.
If the leaves that are bright yellow at the tip and green everywhere else don’t heal just trim the yellow tips off.
Overnight seems like a very fast progression though, I’d be checking to ensure your soil ph is at acceptable levels as we don’t want to be feeding our plants excess Nitrogen when they’re locked out.