...I Have To Change Water Often? I Have A Tropical Fish Take With About 10 Diffrent Tropical Fish In But It Seems I Have To Change Water Often, By Often I Mean Like Once Every Three Days And The Cleaning Isnt Easy. I Have A Very Big Tank So What I Used To Do Was Put Fish In Another Tank An Change Water Then Put Fish Back In. But The Pet Store Sold Me This Pump And Said It Would Be Easyier And It Is But Still I Think Once Every Three Days Is Terrible. And By The Way Its Not Overfeeding Cos I Asked The Store And They Sed Im Feeing About Right. Help..