HagenKB

Broken Thermometer

I broke my thermometer. Will the red liquid hurt my fish?

I broke my thermometer. Will the red liquid hurt my fish?
The medium used in Hagen's glass bulbed thermometers is a red dye mixed alcohol, but the amount used should not be enough to cause harm to your fish. The larger the aquarium, the less chance of any problems. Small aquariums or bowls will still provide plenty of dilution to remain well within safe limits.

You do want to be concerned if any of the small silver balls were released into the tank. Those are made from lead alloy and can be harmful if the fish were to swallow it. It should be removed as rapidly as possible. Also if there are any glass shards, these should be carefully removed as well.

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