View Cart You may change your account settings, including your Billing & Shipping Addresses, Credit Card Information, as well as Express Checkout status.
  Welcome to!  
HOME    HELP    CONTACT US    MY ACCOUNT    SIGN IN - Quality Aquatic Life Direct To Your Door. - Quality Aquatic Life Direct To Your Door.

Diver's Den - WYSIWYG Fish, Corals, Inverts & More
Weekly Specials
Aquarium Supplies Rewards Program
Shipping Rates & Info
How to Order
We're here to help:

Email Us
100% Guarantee
Compatibility Chart
Acclimation Guide
Ideal Water Parameters
Always Quarantine New Arrivals
Articles & Information
Beginner's Area
Build Your Own Reef Cleaner Packages
Certified Captive Grown Corals - 30 day guarantee!
Collector's Corner®
FREE Catalogs
Email-Only Specials

Freshwater Fish Pond Fish Pond Plants Foods/Marine Plants Freshwater Inverts Freshwater Plants
Marine Fish Corals Live Rock Reef Cleaner Packs Marine Inverts ORA Fish/Coral/Inv

Common Aquarium Problems Troubleshooting Guide

Remedy Common Aquarium Problems: Water Quality Troubleshooting Guide
While it may seem like a passive endeavor, regular observation provides important visual cues, indicating changes in water quality and alerts you that something may be off balance in your aquarium. Fundamental water parameters that influence water quality, such as pH, ammonia, nitrite, and nitrate, are relatively easy to monitor through routine testing. However, many conditions associated with poor water quality develop gradually. Early signals may go unnoticed, leading to more serious or more persistent conditions. The following are some common "problems" or visual cues that indicate something may be off balance in your aquarium.


POSSIBLE CAUSE: Population boom of planarian due to overfeeding or excess organic debris. May also be due to fish overpopulation, filter malfunction, or inadequate filtration. While generally considered harmless, large numbers of these worms indicate poor water quality.

RECOMMENDED SOLUTION: Avoid overfeeding and promptly remove uneaten food with a siphon or fine mesh net. Perform regular water changes and siphon out debris from the substrate. Use bacterial additives to supplement existing biological filtration and use water conditioners that actively process and break down organic waste. The planarian population will decrease as water quality improves and the food source for the worms diminishes. Verify filtration is working properly and perform maintenance per manufacturer's recommendations.


POSSIBLE CAUSE: Bacterial bloom triggered by high levels of ammonia. Nitrifying bacteria that consume ammonia reproduce rapidly to the point that they are visible, creating what looks like clouds of swirling, white smoke. Adding too many fish at one time, overfeeding, overcleaning with chlorinated water, and the use of antibiotic medications are common triggers. If bacterial blooms occur without these triggers, it may indicate inadequate nitrifying bacteria or biological filtration.

RECOMMENDED SOLUTION: Use an air pump with airstones to introduce additional oxygen. The air bubbles help release toxic gasses from the water and the added oxygen helps nitrifying bacteria process the ammonia more efficiently. Use bacterial additives to replenish or re-establish beneficial bacteria depleted by medications or large water changes.


POSSIBLE CAUSE: Discoloration due to mineral-rich source water containing iron (i.e. well water). Aquariums with high oxygen levels may experience a more pronounced discoloration (redness) due to the oxidization of dissolved iron particles. High levels of minerals, such as iron and silicate, not only discolor the water but also provide nutrients that spark aggressive algae growth. Water with high mineral content (hard water) also has a greater buffering capacity and makes pH adjustments difficult.

RECOMMENDED SOLUTION: Chemical filter media such as Poly Filter removes specific pollutants such as iron and silicate and is a good choice. Peat or similar water softening chemical media can be used to help stabilize pH to desired levels. However, if the mineral content of the source water is very high, avoid using pH decreasers to adjust pH. The minerals in the hard water will buffer the water, making it difficult to successfully lower the pH. A water purification system such as a reverse osmosis unit provides the most reliable, long-term solution for problems resulting from hard water conditions.


POSSIBLE CAUSE: Chlorine or chloramine in tap water. These chemicals are commonly added to municipal tap water for their disinfectant qualities. Even small quantities of chlorine and chloramine can be detrimental to fish. Chlorine can severely stress fish by attacking their gills, causing them to gasp and breathe heavily. At higher concentrations, chlorine kills. Unfortunately, chlorine and chloramine will not only harm aquarium fish but can affect the entire aquarium system. These chemicals also kill beneficial bacteria and impair biological filtration. As a result, a series of water quality problems, including harmful ammonia spikes, can ensue.

RECOMMENDED SOLUTION: Commercial dechlorinators (chlorine removers) are available to help remove chlorine from tap water. When used as directed, they instantly remove chlorine from tap water to make it safe for aquarium use. However, not all dechlorinators will remove chloramine so it is important to know what chemicals are used to treat your tap water. Our Drs. Foster & Smith Chlorine Neutralizer addresses both chlorine and chloramine to effectively neutralize these harmful chemicals. Reverse osmosis (RO) units are a good choice for serious hobbyists who require large amounts of pure water for sensitive reef aquariums. RO units can remove up to 99.9% of tap water impurities including phosphate, nitrate, minerals, and heavy metals for contaminant-free water.


POSSIBLE CAUSE: A decrease in your aquarium's beneficial bacteria population. These bacteria are necessary to the nitrogen cycle, in which ammonia is broken down. Ammonia spikes are most commonly associated with newly established systems where too many fish are added before a suitable bacteria colony is established. However, ammonia spikes can also occur in mature home aquariums, after gravel substrate or bio-media is cleaned or replaced.

RECOMMENDED SOLUTION: Bacterial additives, such as our Drs. Foster & Smith Live Nitrifying Bacteria help replenish beneficial bacterial populations. Simply add the correct amount to your aquarium while setting up a new system or on a regular basis after routine cleaning in established systems. Also, minimize the amount of beneficial bacteria removed from your aquarium with each cleaning. To do so, use Lee's Ultimate GravelVac Kit to clean aquarium gravel in sections with each water change instead of cleaning the entire substrate floor in one marathon session. Similarly, do not clean or replace all of your filter media at once or when performing water changes. Replace filter media in stages to allow biological and mechanical media to retain existing beneficial bacterial population.


POSSIBLE CAUSE: Overfeeding can often result in the accumulation of uneaten fish food. If excess food is not removed promptly, it can decay and encourage mold or fungus growth. The decaying food is soon covered in unsightly tufts of fuzzy fungus. While this growth may not directly harm aquarium fish, the presence of fungal growth is an indication of poor water quality. As a precaution, it is a good idea to measure water quality with a test kit and, if necessary, perform a partial water change to remove pollutants and improve water quality.

RECOMMENDED SOLUTION: Remove uneaten food and monitor feedings with automatic feeders. These programmable devices offer an easy and convenient way to prevent overfeeding. Automatic feeders reliably dispense appropriate amounts of fish foods whether you are home or away on vacation. Fill these feeders with a variety of flake or pellet food to ensure proper fish nutrition. Controlled feeding not only encourages healthy fish growth, but also plays an important role in maintaining water quality for the overall health of the aquarium.

Ideal for any hobbyist, Tetra EasyStrips™ Aquarium Test Strips allow you to get quick, accurate, and convenient results with a simple dip of the strip.
Marineland Black Diamond Premium Activated Carbon eliminates odors, discoloration, and dissolved organic wastes from aquarium water.

Ideal Water Parameters
The Importance of Regular Water Quality Testing
Test and Treat Tap Water to Prevent Problems
What is the best way to stay on top of the water quality in my aquarium?
In addition to routine water changes, test your water regularly using a test kit. Carefully observe your aquarium daily to detect visual cues that may tip you off to poor water quality.


Click here for a more printer-friendly version of this article.   Click here for a PDF version of this article.   Bookmark and Share


Contact Us
Shipping Rates
Shipping Schedule
How to Order
Track Your Order
Rewards Program
Diver's Den Help
Gift Certificates
Business Partner Program
Email Newsletters
PayPal Credit     PayPal®
WI Facility Open Houses
About Us
Who We Are
Aquatics Specialists
Customer Comments
100% Guarantee
Visit our other sites:
Twitter YouTube Instagram Blog
Freshwater Fish   |   Pond Fish   |   Pond Plants   |   Brackish Fish   |   Freshwater Inverts   |   Freshwater Plants
Marine Fish   |   Corals   |   Live Rock   |   Tank Cleaners   |   Marine Inverts   |   Marine Plants
Visit our Retail Store   |   Tell a Friend About Us   |   Link to Us   |   Site Map   |   FREE Catalogs
bizrate Customer Certified Site - Reviews at Bizrate Drs. Foster & Smith BBB Business Review McAfee Secure sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams
Copyright © 1997-2016, Petco Wellness, LLC. All rights reserved.
2253 Air Park Road, P.O. Box 100, Rhinelander, Wisconsin 54501
Terms of Use  |   Privacy Policy  |   Your CA Privacy Rights  |   Copyright Claims  |   Pet Medical Records Policy