Fishician® — Your Complete Aquarium Companion

Fishician is a free web app that helps fishkeepers set up, stock, and maintain healthy aquariums — freshwater and saltwater. Track your tanks, log water tests, and get AI-assisted fish health guidance in one place.

What you can do with Fishician

• Manage aquariums: record tanks, livestock, and equipment; see stocking levels and maintenance schedules at a glance.
• Track water parameters: log ammonia, nitrite, nitrate, pH, temperature and more, with trend charts over time.
• AI fish health scan: describe symptoms or upload a photo and get an AI-assisted analysis with suggested next steps. Not a substitute for a qualified aquatic veterinarian.
• Compatibility checker: build a stocking plan across 600+ freshwater and saltwater species with temperament, tank size, and care-need checks.
• Calculators and guides: aquarium volume, current-label ratio math, species and food-label feeding checks, equipment planning references, source-linked care guides, and a full tank builder.
• Community: share your tanks, join species groups, and ask questions in the fishkeeping forum.

Free to use

Core tools work without an account. A free account adds cloud sync, AI health analysis, and community posting. This page loads the full application when JavaScript is available.

Source-linked aquarium guides

Fishician publishes an original, source-linked guide library covering the decisions fishkeepers actually have to make. Every guide states what it covers, cites the veterinary and university-extension sources supporting its claims, carries a publication and update date, and says plainly where general guidance stops and species-specific or veterinary judgement begins. We do not publish universal timers, percentages, or portion prescriptions, because those do not survive contact with real species, real equipment, and real water.

Start here

• Beginner aquarium setup — the order of operations, from livestock plan to first routine
• Starting a freshwater aquarium
• Starting a saltwater aquarium
• Aquarium cycling and water testing
• What each water parameter tells you
• Your tank's real water volume
• Planning a build: what to buy first

Keeping the system stable

• Aquarium water changes
• Aquarium filtration explained
• Temperature and heating
• Routine maintenance and observation
• Understanding aquarium algae
• Cloudy water: causes and fixes
• Aeration and dissolved oxygen
• Source water: tap, well, and purified
• Using a water test kit correctly
• Dosing safely from a label

Environment and equipment

• Lighting and photoperiod
• Substrate and hardscape
• What equipment specifications mean
• Power outages and equipment failure
• Moving or upgrading an aquarium

Livestock and health

• Stocking and compatibility
• Acclimating new arrivals
• Quarantining new fish
• Reading normal fish behaviour
• Early warning signs in aquarium fish
• Feeding and nutrition
• Reading a fish food label

Specialized systems

• Planted tank basics
• Reef tank basics

Browse all aquarium guides

How Fishician decides what to publish

Fishician separates source-linked editorial guides, working catalog data, user-generated community posts, and AI output, and labels each for what it is. Editorial guides are written for a defined task, reviewed against primary sources, and dated. Species catalog records support the planning tools, and an individual record stays out of search distribution until its husbandry claims, sources, author, reviewer, and dates are complete — we would rather publish fewer pages than publish a template filled in with defaults.

For health, water quality, biosecurity, and husbandry fundamentals we prefer veterinary manuals, university extension and aquaculture programs, recognized scientific databases, primary research, and the current manufacturer instructions for a named product. When sources disagree, the more cautious position is published while the difference is investigated. Corrections are welcome and are handled through a documented process — see our editorial standards or send a correction.

Nothing on Fishician is veterinary advice. Severe, urgent, persistent, or uncertain animal-health problems belong with a qualified aquatic veterinarian.

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