Fresh transplant means fresh nutrients in new soil.. clock gets set back on ferts.
Most likely, yes. Give water-only irrigation 6.5-6.8pH if you can. Just normal stuff- 20% runoff, wait for 1" to dry, rinse and repeat.. feel weight to learn dry and wet.
when you see a lower leaf show a hint of yellow, begin a fertilization regiment.. maybe a little diluted to start.. every other day or every third, really depends on how much you give.. both can work well.. read plant and react, though. best laid plans of mice and men and such