You need your ammonia, nitrite and nitrate test kits, you test every couple of days and your ammonia will rise, then you will have ammonia and nitrite, then you will have all three, then just nitrite and nitrate, then just nitrate, when all you have left is nitrate, you will be ready for fish, do a water change to get your nitrate down before adding anything, it should be less than 20 ppm and preferrably less than five, after adding fish you will need to keep monitoring the ammonia and nitrite, if it raises, do small waterchanges to keep it in check till your bacteria raises to compensate more waste. add fish slowely, add a clean up crew about a week or so after your brown diatom bloom.
In other words, you probably wont have to take the small peice of shrimp out, it will most likely disappear. Also, read the sticky posts in new hobbiests section.