I've seen that a lot of people have had Melanotaenia boesemani and Melanotaenia praecox (Neon) but does anyone have experience with the rainbows mentioned in the title? They're Parkinson's, McCulloch's, and Madagascar respectively. I've read a lot about them and am just wondering if anyone has any pointers for someone who is thinking about getting some in the future. Is it safe to stock rainbows 2M to 2F, or should there be more females? I've read that it's safer to always have more females, but also that you can stock 1:1.