I've just fed my fish and have spotted an insect in my tank sitting on top of some Salvinia. It's definitely alive as it moved but I have no idea what it is, and whether I should remove it or just leave it be?
It's about 2cm long with a very thin body, wings, and bug eyes on either side of its head.
It looks like a damsel fly, is it like a dragon fly but smaller? It's a bit hard to see its wings in that picture. I'm not sure whether they hibernate or just lay their eggs and die off. It might have done so in your tank so keep an eye out for larva.
ETA- having had a closer look, it looks like there is a larva case next to it lying on the salvinia so maybe it has just emerged.