My rainbow is breeding right now. I got it on the 4th try with a level 10 flower and a level 10 mud dragon. On the first try I got a poison - 30 min incubation. On the second try I got a flower - 1 hour incubation. On the third try I got a seaweed - 5 hour incubation. And... Finally on the fourth try I got a rainbow. So keep on trying! I am only level 16 so there's hope! I'm thebirdman7 if you want to add me. Good luck!