Get more dragons but it's easier to put paths in and other decorations then you'll get more visitors who give you more money.
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What I did was covered the hole island in path and as I got dragon habitats I put them on the path.(you will get your money back.) I got about 200 visitors by doing it. I really hope this helped.
There is no dragonvale for PC
Buy more or win them at the Colosseum.
to get gems for free use the colosseum or try to get your friends on dragonvale to send you one free jem. If you want add me CSB_123.
Hacking in a DragonVale account for more gems and food is not allowed per the game rules.