Recognize a problem before choosing a treatment.
A symptom is not automatically a diagnosis. Clamped fins, hiding, fast breathing, loss of appetite, spots and unusual swimming can have multiple causes. These guides start with water quality, environment and species-specific behavior, then explain when disease becomes the more likely explanation.
Separate normal species behavior from genuine warning signs.
Water quality and temperature problems can mimic disease.
Use combinations of symptoms instead of treating one sign in isolation.
Avoid shotgun medication when the cause is still unclear.
Start with the decision, then go deeper.
Use this section as a reference rather than a stream of posts. The most useful article is the one that matches the decision in front of you: choosing livestock, interpreting a test result, sizing equipment, correcting a maintenance problem or understanding a species requirement.
As the EasyFreshWater library grows, related guides in this section will link to one another so that a broad question can lead naturally into a more specific answer without creating dozens of thin pages around the same intent.
Fish Health & Disease articles
This landing page is already live, but individual guides remain drafts until they meet the publication standard.