I have my tank for about 10 years now. Three years ago filter stopped working and has been replaced with Tetra that was available at hand. It was working fine until couple months ago. It is still working. Only problem I have is that everytime I change filter media and plugin the filter, it is spewing insane amount of solid debris. When it happened first time I lost one of my beloved blood red parrot. Melafix cleaned the infection, but large amounts of solid debris at every filter media change worries me. Any help will be greatly appreciated.