Fine Tune the Filter
Most tanks are outfitted with one or more filters, which are meant to collect waste, though they do not fully remove it. Each tank is set up a bit differently, some with disposable filters which can be tossed and replaced (usually on a monthly schedule), while others use permanent ones. If your filter uses multiple disposable cartridges, alternate changing them out so you're not introducing a slew of entirely new filters into your system at once, and removing all the beneficial bacteria. For those with tanks that use permanent cartridges, rinse them in some of the siphoned-out water or de-chlorinate a batch for cleaning purposes.
- American Pet Products Association. "Industry Statistics & Trends: Pet Ownership." (Nov. 3, 2010).http://www.americanpetproducts.org/press_industrytrends.asp
- Skomal, Gregory. Freshwater Aquarium: Your Happy Healthy Pet. John Wiley and Sons, 2005. (Nov. 3, 2010).
- Wickham, Mike. "Cleaning Fish Aquariums." Fish Channel. (Nov. 3, 2010). http://www.fishchannel.com/fish-health/healthy-aquariums/dont-destroy-helpful-bacteria.aspx
Goldfish are easy to care for, as long as you follow three basic steps. HowStuffWorks tells you what they are.