To summarize and to retaliate the following facts:
1. Ktp juice is a safe and natural way to lower your PH to the ideal PH for your Betta. The ideal PH value for Betta's water condition is 6.5 to 6.8 slightly acidic. The PH value for ktp juice is 5, therefore it is important that you exercise control and due care not to have put too thick ktp juice unless necessary to treat keyhole or to strengthen thinning of fins and scales. Just slightly brownish
2. Ktp juice is filled with Beneficial Tannins and FlavoNoids ( vitamin P). Can reduce the heavy metal content ( the key word here is reduce and not treat)
3. Ktp juice can also prevent fungus from forming on the eggs of the Betta.
4. Enhancing of natural colour and strengthening of scales.
Some articles you can read more about ktp leaf:
http://en.wikipedia.org/wiki/Terminalia_
http://siamsbestbettas.com/articles.html
http://www.allnaturalpetcare.com/Ind...-Aquarium.html