Yes, I was speaking of the magna. I have one tank set up for them. I feed them green water and algae and then take some out for FHM and gambusia. I tried introducing the magna in some of my ponds and it just did not work. Maybe I could try rereleasing them when there are not so many hungry fry mouths to eat them. The smaller species have a lot better survivability. In this case bigger is not better. I have seen water practically soupy with them before in the right conditions, and other times they just are not where I am looking. The magna are just easier for me to deal with and actually easier to see. Same reason I use so many pink FHM.