Hey Avalor! nice to finally talk to you (we're nbrs in-game)! I'm the same level as you and i agree this was crazy but rainbow is my weakness so all the animals were getting in my forest one way or another, lol.
You don't have to actually finish breeding rainbow dragon & ******s. The grand uni will appear as soon as you start breeding the 2, so all you have to worry about is speeding the hatching & evolution of rainbow dragon to level 4 so he's old enough to breed.
and sorry...in case you didn't know, rainbow dragon is 19hr incubation, 19hr evolution.