Originally Posted by shellieca
The ones I have; 10g, 20g & a 40g, all have one port but I have the 40g set up with a wye connection going to 2 10g tanks. One of my 10g air pumps is noisier than the others for some reason, could be the location somewhat magnifying the noise. These are not completely silent but for me they very low noise & I rarely ever notice them, if a cord lays on the pump it really rattles.
I tried out a small Top Fin pump & found it much louder, I didn't like it.
This is quite interesting, I actually tried the whisper and Topfin Mini and the whisper was louder, has stronger vibration and actually jumps on the flat surface. My Topfin Mini did not have that at all. Oh even I if I put them on top of a folded towel to mute the noice of vibration against a hard surface, Topfin still gets better results in noise and vibration.
In my quest for a quiet pump, I also tried Marina mini for my 5g AQ., it is the same as Whisper in noise and vibration, if not worse.