I bought these sheets to build an Amazon blackwater aquarium for my discus. When I opened the package I noticed that the planks were very dry and crumbly. From there it only got worse. When trying to wash them under a weak jet of water, they broke. So I decided to just make my own blackwater extract. this also didn't work after boiling various amounts of leaves for several hours, the best I could get out of these leaves was something like weak tea. A very light brown color, definitely not close to the Blackwater extract I was looking for. I'm not sure if they should have an expiration date or if they are just a bad product. But I will never buy again.
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