Hello, I'm new in this forum. I'll introduce my turtles and the aquariums they live in but first of all I really need help for my filter that makes annoyiny noise for a while as if something inside clattering.
The uploaded video is below. It's a Tectratec Ex 1200 Plus filter. I've been using it for only two months. when I noticed the noise I sent it (only the head part) to Tetra service that gives technical support; they checked that part and said there is nothing wrong with the motor or the impeller. They sent it back but the problem goes on. I think it is not air trapping or media clogging but what is it? I really need your ideas.