What's This Filter Thing?

Neon.Tetra

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Friend offered a thing thats not a filter, but disturbs the water. Fits like a filter on the side of the tank. But doesn't filter.
What is it?

Should I get one for my betta tank? I know they don't like surface water movement but has anyone ever heard of one of these before?

ty
 
probably a powerhead.

There is no reason to have one with a betta, as they are used to help oxygenate the water. As you probably know, bettas are surface breathers. You would only cause stress by creating an unnecessary current.
 

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