Waterproof Sharpie for the inside of an aquarium - harmful for fish?

 

It is unlikely that substances from the dried ink will be released into the water.

However, we cannot guarantee whether the inks on the decorative part will last in the long term. Waterproof does not necessarily mean 100% durable in water on all materials.

We have also never tested whether the inks are resistant to nibbling fish mouths.

Even if the ink does not pose any health risks, we cannot guarantee this.

It is therefore at the customer's discretion.

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