acroholicreefer
New member
I have 2 tunze 6105 and have had these pumps for a little bit over 2 1/2 years. Both of these pumps are controlled off of an apex. One of these pumps is dead silent. The other one makes a humming noise. This one also has a problem of restarting after I turn it off during a water change, even if I have cleaned it recently. Is this noise a sign that something is grinding and should I be concerned about this? Is there any way to fix it?