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Discussion Starter #1
Can they be fully submerged? Because I always see them at the top of aquariums with the top sticking out of the water...
 

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Discussion Starter #3
It depends on the brand of filter. Each one comes with specific instructions that should tell you.
The one I was thinking about was the Marina i25 internal filter. I looked up the instructions online and it has a clip for the side of the aquarium, but it only mentions a minimum water line....
 
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