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I had a Whisper in my 2.5 gal for a while. It worked ok, the suction cups come un-sucked, though, and it didn't do so great of a job. I just bought a TOM internal mini filter, (I think about the same $$ at Petsmart,) and it works much better! Much quieter, adjustable water flow, cartriges cost the same as the Whisper, and it keeps the water MUCH clearer. Much better buy if you ask a former Tetra Whisper owner, though if you keep the Whisper filter, it does a decent job and doesn't have too strong a current for a betta.
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