Is he bored?

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Golden_Fox_Girl

Aquarium Advice Apprentice
Joined
Jan 26, 2020
Messages
16
Location
Australia
So lately I have noticed my comet getting into this weird habit of “attacking” the suction cup that holds the heater. Is this normal behaviour? Is he bored?
 
It may have algae on it. Goldfish will eat algae occasionally. My platys will "attack" the heater for the same reason.
 
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