Don’t know why my last post came double …. 😉
And I forgot one thing to mention: yes, as you write, I also renew the whole cultures after a time, perhaps I should write diary… If the culture begins to become stinky, I pour the water through a sieve and cast the water away. Yes, I also don’t clean the bowls. Fill up with used water. Tap or osmosis had made no difference for me, and of course, put at once the sieved moina into it. After two or three days, culture is ready again.
By the way, in the tank I had put new moina in, I found before renewing many dead moina at the water surface (I thought they were dead, because they didn’t move. So I sieved them away before I caught the living ones to renew the culture …
But it makes also a difference, how many tanks you have to supply 😉 … I have just four, so I guess an extensive moina breed is sufficient for me.