I've had my pond for about six months. It is raised-side, 2m square about 45cm deep. Lots of white clouds in it.
And this weekend I discovered leeches in it!
There are also damselfly larvae, which I've been removing since Spidersweb said they eat fish fry.
I've got diving beetles and boatmen, daphnia and mozzie larvae too.
I first spotted the leeches on a diving beetle, then when I was repotting a waterlily, got one on my hand. Yuck!
They're really tiny, about 1/2cm at most.
Does anyone know if they will be a problem for the white clouds?? I want more fry and haven't noticed any for months.