The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Amphibians (1 member)
- Aquarium Basics (3 members)
- Aquarium Fish (2 members)
- Coldwater (1 member)
- Cycling (3 members)
- Errors reported by Module String (1 member)
- Fish (8 members)
- Freshwater (6 members)
- Illness (2 members)
- Invertebrates (2 members)
- Lua-based templates (1 member)
- Pages with TemplateStyles errors (9 members)
- Pages with broken file links (21 members)
- Pages with script errors (5 members)
- Plant (1 member)
- Template documentation (1 member)
- Templates imported from Wikipedia (1 member)
- Tropical Fish (2 members)
- Water Chemistry (2 members)