Ammonia: 0
Nitrite: 0
Nitrate: less than 20
pH: 6.5-8
Hardness (GH): 3-4 dGH
Alkalinity (KH): 3-5 dKH

someone correct me if im wrong

 

pH: 6.5-8

I' say 6.0 to 7.5... agree with the rest

 

pH and hardness depends on who you ask and which species.

Some Wild species do best with pH of 4.0-7.0 and hardness of 1-5 dGh. Another 5.0-7.5 and 1-10. Depends on where they were spawned. Ornamental Betta aren't as delicate so parameters aren't as rigid as Wilds. I wonder if that's because they aren't universally raised under the same conditions? A U.S. pet store supplier a friend knew bred his Betta in parameters of 7.5 pH and 10 dGh.

Ammonia: 0 ppm
Nitrites: 0 ppm
Nitrates: 10 ppm
pH: 6-8
dGH: 1-14
dKH: 1-14

 

Yep, my ph is always around 8-8.5, mine do ok but my imports never last as long as locally bred.