Adding a school of neon tetras
Fifteen neon tetras went in after three weeks in a small quarantine tank. I lost one in the first week, which the shop said is normal for this species.
Acclimatisation took about an hour: the bag floated for twenty minutes, then I added a cup of tank water every ten minutes. Lights stayed off for the rest of the day.
They school much tighter in the evening and spread out during the day. Very calm community with the corydoras.