Thanks, some of them do look a bit scary and big, but my nagyi soon gobbled them up! I wasn’t sure what mayfly larvae eat, because they look so similar to damselfly larvae, but it seems they eat decaying plant matter, so unlikely to be harmful to even small fish.
Yeah most of the Mayfly larve feed on detritus. Def not harmfull, they are pretty fast and hard to catch sometimes, but it makes the fish sport a bit so its even better. Another nice think is they do not swim on the surface so paros dont have aproach it to hunt them.