Fish Antifungals
True fungal infections are less common than most keepers think. Cotton-like patches are often columnaris, which is bacterial. Check our comparison guide before choosing an antifungal.
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Fungus is less common than it looks
Many fish keepers see cotton-like growth and assume fungus, but the same appearance is often columnaris, a bacterial infection that spreads quickly and needs an antibiotic. True fungal infections tend to be fluffy tufts on damaged tissue or dead eggs. If you are unsure, read our comparison guide or consider a Fungus and Columnaris Pack, which covers both possibilities.
Treatment tips
- Treat in a hospital tank and keep water pristine.
- Correct the underlying cause, such as injury or poor water quality.
- Follow the label and complete the course.
Antifungals FAQ
Are antifungals the same as antibiotics?
No. Antifungals treat fungi and antibiotics treat bacteria. Choosing the right one depends on the diagnosis.
How can I tell fungus from columnaris?
True fungus is fluffy and cotton-like on damaged tissue. Columnaris is bacterial, spreads fast and often looks like pale or frayed patches. See our guide for a side-by-side comparison.
Do I need a hospital tank?
It is recommended. It protects your main tank and lets you dose accurately.