Crested's don't need an external heat source unless your house is really cold, they're as cute as can be . . and they are aboreal, so with some sticks and moss, you can make them a really cool jungle gym in a 30.
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Porter

Reptiles
1.0 Crested Gecko (Tort)

Fish
2.0 Oscars
2.1 Polypterus
0.0.5 Angels
0.0.1 Dusky Jawfish (Golum)
and many more . . .

Mammals
1.1 Alley Cats
0.1 Rat
0.1 Chinchilla
1.0 Degu
1.0 Boyfriend (Mike)