The Discus Learning Center (DLC)

The Discus Learning Center is a collection of articles, forming a comprehensive knowledge base for mastering all aspects of the art of keeping and collecting discus fish. It is a completely free resource dedicated to discus and the discus community.

Begin by browsing the articles below. Each article has a comment section on the bottom so that you may engage our experts -- and each other. Let's get started on our journey into the wonderful world of the incredible discus fish, and learn why the discus fish lives up to its nickname, the "King of the Aquarium."

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Diagnosing Your Discus
These treatments are ones that I have used successfully. They are effective and fairly safe. The medications are readily available and simple to use. Intestinal Flagellates Symptoms:  Your discus may quit eating or spit out its food. White, stringy, mucus-like feces will hang like a... Read More
Intestinal Parasites in Tropical Fish
Parasites are a natural components of all healthy ecosystems and all fish, including tropical Discus, can have internal and intestinal parasites. Even though these internal parasites are a natural occurrence, not a contamination, in certain conditions and circumstances, they can be problematic to... Read More
The Use of Garlic Against Tapeworm in Discus, by Jack Wattley
During a discus presentation in Chicago (and in New York) several years ago I mentioned garlic as a preventative agent against infestations of internal parasites in discus. At that time I was still working with it and suggested to the audience that they try different methods of application. None... Read More
Beef Heart -- Tapeworms, and other Nonsense
Let's put this intestinal worm business in perspective.   If you're new to the hobby or even been in it for a while one of the great dangers you and your fish will face is Mis-information. And I can think of no greater area to be concerned about than the nonsense information generally... Read More
Symptoms That Your Discus Is Stressed
In short, stressed fish don't ``act normal'' (with ``normal'' defined according to the species of fish). Once you've had fish for a few weeks, you'll see that each species behaves in its own characteristic way (that's why fish are fun to have!). Some fish tend to always stay near the top of the... Read More
Common Causes of Fish Stress in the Aquarium
In this section, we list some of the more common stress-inducing conditions. In all cases, the level of stress induced by a specific factor is highly species-dependent. You should be aware of the type of stress that will be present in your tanks and select fish known to tolerate such conditions... Read More
What Stress Means, and Why it is Bad for Your Fish
Most fish can tolerate environmental conditions that differ somewhat from the natural conditions in which they evolved. This does not mean, however, that they will be as healthy or live their full normal life span. For example, keeping a fish in water that is cooler (or warmer) than its preferred... Read More
Hexamita in Tropical Fish
Hexamita is a flagellate protozoa that affects the gastrointestinal tract of ornamental fish. Protozoa are microscopic, single-celled organisms that may or may not be parasitic to fish.    Hexamita in Tropical Fish   Can Fish Die from Hexamita? Even though Hexamita is... Read More
Spironucleus in Aquarium Fish
Spironucleus is a flagellate parasite that affects a large group of fish, including ornamental tropical species. Even though the Spironucleus is responsible for Hole in the head disease in fish ( Head and Lateral Line Erosion), not intestinal disorders like that of Hexamita in fish, It is... Read More
Fish Fungus
Fungus consists of fine white threads known as hyphae that pass through organic material. These hyphae form distinctive patches on fish that resemble cotton wool.   Pathology   The fungi involved include species of Achyla and Saprolegia, often referred to collectively as water... Read More
The Importance of the Quarantine Process for Discus
Discus fish care should be taken seriously. For this reason therefore, there are different scenarios that will require a quarantine period.   Discus Quarantine Process – Scenario #1- Purchase of New Discus Fish Whenever you get new discus fish you should quarantine them before putting... Read More
Different Kinds of Discus Acclimation Methods
Acclimation is critical for discus fish. The water that your new discus fish are packaged in has different temperature and pH parameters than your fish tank. Due to the fact that discus fish are very sensitive to even minor changes in temperature and pH, proper acclimation is the key to ensuring... Read More
More on Discus Pop-Eye
Symptoms: Eyeball looks cloudy and swollen and is protruding.  If not treated quickly it can cause blindness and death.   pop-eye   Cause: Bacterial infection usually caused by poor water quality.   Is it contagious to other fish:  No   Treatment:... Read More
More on Discus Cloudy Eye
Symptom: White film on discus eyes.   Cause: Poor Water Quality   Is it Contagious to other fish: No   Treatment: Perform large water changes for 3-4 consecutive days until white film is gone.   Summary Cloudy eye on discus is a common fungus that is caused... Read More
Treatment and Causes of Discus Ich
Discus Ich is a parasitic infection of fresh water fish caused by ciliate. It can be ichthyology which is a branch of zoology devoted to the study of fish. “Ich” is the small, white and clear spots on the bodies of discus and several on the fins. The spots are a bit smaller than the typical salt... Read More
Caring for Wild Discus
Wild discus fish are a bit harder and demanding to keep compared to the domestic discus fish. However, the basic requirements for both are all the same. These requirements are like warm, clean, fresh water as well as a varied diet. Wild discus care therefore would be easier for one who has... Read More