"Safe for aquarium use" just means it can stay submerged without rotting. All wood should be cleaned throughly before use. You have no idea where it had been, how many different environments it has been exposed to, ect.
If you are not going to have a deep water feature, tannins won't be an issue. They don't hurt the frogs any, in fact, they are helpful in the rearing of dart frog tads.
Education is the most powerful weapon we can use to change the world ~ Nelson Mandela





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