I run carbon filters daily change filter once a month I run 2 aquaclear 300 carbon filtered/sponge/amonia pack,1 skilter also carbon packed,aquaclear 5000 powerhead .change filters monthly and clean sponges monthly..125 gal tank..next tank will have wetdry bio filter.but it is effective in maintaing this tank.for those of you that don't have the finances for that expencive tank we all want this does keep a healthy tank for a fraction of the cost