Yeah... my research has said that bettas and guppies dig the warmer waters (bettas in particular).
Guppies range from 64-81 degrees F (respectively), and Bettas thrive in water between 75 and 84 degrees F (again, generally). Keeping the two species of fish together, I wouldn't go any lower than 75 degrees in the water. I dunno about the newts. :S
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10 Gal.
5 Neon Tetras "The Bone Busters"
-3 Neons
-2 Black Neons "Sid & Nancy"
1 Platy "The Hell's Angels"
- Mickey Mouse "Chamilla"
2 Yo Yo Botias "The Southside Posse"
- "Cheech and Chong" 
1 Chinese Algae Eater "Davey Jones"
2.5 Gal.
1 Crowntail Betta "Nani" (Hawaiian for beautiful) 
Gold Inca Snail "Gary"
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