Hello
I grow daphnia in an outdoor 100L (+/- 25g) tank, and they grew very very well for a few months. then on the first hot summer day, most of the stock died. Though, after a few weeks they bounced back to their former great, at which point i messed up and had a mass die off again. Now, their tank water is green (awesome daphnia food, apparently) and there are fairly many daphnia in the water, which i check by swooping a net through the tank. But, their numbers are not going up-there aren't enough to harvest yet. And after several weeks with enough food and oxygen, they just aren't multiplying as they use to. . . .
any ideas on what the problem could, on what i could do?

are you a fish hobbyist or a daphina hobbyist

either go buy some daphina for your fish or stop this odd "occupation" and get into the fish hobby

you are spending too much time on daphina than on the fish...excuse my blunt attitude.........................ugh