In other news, I moved the 2 surviving shrimp from the killie tank back to the bug tank, and they seem quite happy. No sign of the 3rd shrimp, presumably the one that died was the one that was trying to lie down in the bug tank when I plucked it to 'safety' and it died anyway.
So the survivers went from stream to container, to rain water tank, to slightly salty killie tank, and back to partially water changed bug tank. Hardy little critters, very interested and alert.
Found a green hydra, actually saw it trying to catch an ostracod - ostracod went up to it, next thing ostracod leapt away like it had been burnt (stung).
Also I see there are some much fatter daphnia in among the others, these I presume are pregnant so that's good news for bug farmers :happy2:
Also trying to ID a swimming beetle. I don't think it's a diving beetle, it's round and black like a katipo spider with similar markings in pale colour and you can see the legs scampering away under water. About the size of a dressmakers pin head is the biggest.