I have two of the Tetra Whisper filters for the 5-10g tanks. They are both side by side, one in my 5.5g & the other in my 10g.
The one in the 5.5g is so quiet, you can't even hear it. HOWEVER....the one in the 10g is very
loud. It's obnoxious.
If you look at the top of the filter (they don't come with a little cover for the top like the little 3g whispers do) the water is like sloshing around behind the actual filter part. So then it 'sloshes' into my fish tank & my girls don't like that very much.
How do I quiet/calm down this filter? I've tried wiggling around the charcoal pouch & the mesh screen. Doesn't seem to work....all of my tanks are in my bedroom & I couldn't even sleep last night because it was so loud.