I have a 2.5g sitting cycled but empty (cycle being kept by a bit of dead krill), and I'm looking for something cool to put in it. I know ghost shrimp are probably an option, but I'm looking for something a bit more unusual. It has a tight lid, so things with wings would be an option. Maybe a water scorpion or a big ole water beetle? Or- how about a toebiter? I found a toebiter once, so I know we have them around here, but would I have to feed it live food?
Also, if I were to grow a water beetle larva up to adult, would I be able to release it without any concern of pathogen transfers if I just took it down to a river and let it fly away without any water? Water beetle larvae are the coolest things.