What Type Of Tea Has Tannic Acid? Some sources say black tea has the highest tannin concentration, while green tea is often credited with having the lowest. White and oolong teas usually fall somewhere in between, but the amount in each type can vary considerably depending on how they’re produced (7). What kind of tea
Are Wood Tannins Bad For Fish? Tannins cause the brownish or yellowish tint of aquarium water. The discoloration of water is not a significant problem – it will not harm the fish. However, tannins are usually acidic. They will slowly lower the pH of the water, which can ultimately harm the fish. Are tannins healthy
Can Fish Die From Too Much Tannins? It has some effects on your water parameters too. Tannic acid is, unsurprisingly, acidic, so it can lower your pH. The pH change is usually subtle but you may need to keep an eye on it initially after adding new wood/leaves. If the pH changes too quickly it