I wouldn't be worried about Nitrite at all.
If you been cycling since Dec 18 you should be fine.
Just take the shrimp out and test the next 5 days for the ammonia to go down.
If ammonia is within range 0.1 than start looking for your first cheap fish (Damsel or so).
If the first fish will be ok than after a week you can ad a nicer fish.
After 3/4 weeks you can ad some easy corals.
Mean while keep testing on your PO4 and ammonia.
It's good to know also where your PH, ALK, CAL and MAG is by next weekend.
Let us know where you at with your # in a few days.
Make sure your salt is 1.026......not 1.25.