Yea you're ammonia will go through the roof, then decline then nitrites will go up sky high, then decrese then nitrates will rise then decrease. When it is stable for a few days do a 20% water change and you'll bo complete.
The LR will only help it, It is much better to add it all at once because you don't want to cause a mini-cycle after the initial cycle is done.
If I were you I would take out the damsels, add a peeled live shrimp and let nature take its course.