I've been using Amy's Ketapang Almond leaves and barks from ebay for the past 4 years. I'm continuing using them in my 75g Discus tank. I find the almond leaves and bark to be very beneficial for my home aquaria as it helps leach therapeutic tannins and humic acid into the water as well as help lowering the pH in my tank. The yellow tanic water is natural and the smell of it is woody. I have never had any issues with these leaves or bark. You can see in the video that I'm using more than the recommended dosage from Amy's. Amy's very great to deal with and always communicates well. Check out her ebay store here http://stores.ebay.com/Amys-Ketapang-Inc Considerably well priced and affordable for normal Joe's like myself; a bag of 200g lasts me about 1 year. I've always stocked up. My testimonial for Amy: "Thank you Amy for offering these Almond leaves and almond bark products for us hobbyists at an affordable price. It have been buying and continuously using your almond leaves for the past 4 years for my South American themed fish aquarium. Whether the leaves are A+ grade, B, C, or D grade, it still does the job providing a natural habitat for my prized fish. I have found that the fish are much healthier in behaviour and health. I have noticed a big difference between when I use it and when I don't use almond leaves - I find the fish to be more proned to illness when NOT using the leaves. There is definitely a benefit for using the leaves in a home aquaria. It provides healthy tannins and humic acid for the health of my fish and plants; and helps lower the pH of the water. Best of all, it provides additional shelters for my ground dwelling rare corydoras, dwarf cichlids, and fancy plecos (L134). I have referred my other fellow hobbyists to try Amy's almond leaves because I really do stand by Amy's almond leaves.. In my 33 gallon tank, I use 10 leaves and 10 almond bark, never had an issue. For my 75 gallon tank, I use over 25+ leaves and over 20+ almond barks, no issue. My dosages are not as recommended but every home aquaria is different, see what works for your tank. For the few negative feedbacks given, I would just take with a grain of salt, I would say it's not entirely the leaves that was the cause. Fish can die due to many different variables or just natural causes. Like anything in the home aquaria, your fish needs to be acclimatized slowly even with the leaves. I'm keep discus and still use a lot of almond leaves and barks. I am confident enough to put the number of leaves and bark into my tank because I trust the leaves and bark. I just think the buyers and hobbyists need to know what they're doing first and stop blaming the leaves. A bit unfair to Amy when there's many variables that may attribute to the death of a fish - most likely from a sudden drastic change in water parameters. Nonetheless, thank you Amy and I look forward to receiving my next big order of your quality almond leaves and almond barks."