Tannic acid is a specific form of tannin, a type of polyphenol. Tannic acid will lower the PH of your tank water. Make it slightly more acidic. Aquatic plants prefer this type of water. It removes the amber color and will maintain stable water conditions, which is what the fish need for sustained good health.
Tanninsalso inhibit the growth of fungus, promote a strong immune system, and improves your betta's health.
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