Yeh, I had a 7 gallon which they were in, but I had to move them into nets, in the single tank, because I was going away (still am away), and it was easier for my mate to feed in one tank.
I don't think I've lost anymore since. I released most of them into the main tank, and I think they're all fine. Have still got a bunch at 0.5cm in a breeding trap. Will be putting them into the net/7G when I get home.
Thanks