I am new to this game and I am not sure if this question had been asked before. In order to breed rare dragon, I keep breeding but I am no luck and every time I get the common crossbreed. I have several firestorm and they occupied 2 large habitats. Now the next egg is hatching (but again firestorm egg), I wonder I should buy a new habitat for it or sell one/some existing low level firestorm? And I am running out of coins currently. Thanks!