Hi,
I cleaned the mechanical rings and rinsed the biological basket in tank water, rinsed the foam in tank water and replaced the white top filter.
I have gouramis 5 x 4-5", 2 x 3-4" black widow, 1 x betta, 10 cardinal tetras, 7 xharlequin rasboras, 2 farlowellas, 9 corys, 2 african dwarf...