Woo hoo! I’m so excited! I just got 6 of them yesterday and have been watching them closely. Some of them started doing this odd dance where one (presumably the female) is still in the water and the other (i’m assuming a male) swims in a U shape back and forth underneath her. They then go into the vegetation and roll all around in it.
I looked closely but couldnt see any eggs. I guess theyre too little to see.
Anyway I’m seriously chuffed with the whole thing 
I know i’m new here (except I have been an almost daily lurker for about 5 years) and nobody will reply but I had to tell someone!