uh, Froggie, that was a bit incorrect.
Ph ranges from 0-14. 0-6.9 is acidic. 7 is perfect, neither acidic or alkine. 7.1-14 is alkine.
The perfect Ph for bettas is around 6.6- 7.5? I think. Someone will correct me if I'm wrong,
You should not try to control it, bettas will adapt to different ph levels.
You can measure the with liquid water testing kits or strips. Strips are often inaccurate, but cheap. Liquid tests are more expensive, but last longer and are more accurate.
edit: are you sure you aren't thinking about ammonia? Ph is in the water, and can't be taken out with frequent water changes because that's the way your water is. Ammonia is excreted into the water and can be taken out with frequent water changes and by cycling the tank...
Last edited by JKfish; 07-30-2010 at 12:49 PM.