Tools · Wiki · Articles · Tips & Tricks
The knowledge gate of the aquarium hobby
Aquarium Knowledge is a free gold mine of aquarium knowledge for hobbyists. We don’t sell anything — we build accurate tools, a wiki, and articles, and we only suggest gear that experienced keepers have already tested in their own tanks.
About us
A knowledge base built by hobbyists, not a shop
Aquarium Knowledge exists to make reliable aquarium knowledge free and easy to find. The hobby is full of scattered, contradictory, commercially motivated advice — we are here to give straight answers: precise calculators, a wiki that explains the terms, articles that explain the why, and tips that have been tested in real tanks.
Everything is written and maintained by keepers withat least five years of hands-on experience. When a topic genuinely calls for gear, we only suggest products we have bought, run, and lived with — clearly labelled as opinion from real use, never advertising.
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Every corner of Aquarium Knowledge
Tools
Free, no-signup calculators with printable, shareable results.
Available now
Aquarium & Fish Tank Volume Calculator
Water volume in US gallons and litres across twelve tank shapes — bowfronts, corner pentagons, hexagons, and sumps — with fill depth, substrate displacement, and water weight.
Open →
Coming soon
More calculators
Stocking, dosing, and lighting calculators are in the works and will follow the same engineering-grade accuracy.
Wiki
Practical aquarium reference guides, organised by topic.
Available now
Fish Wiki
Structured definitions of tank shapes, equipment, water-chemistry terms, and species care basics — written for beginners, useful for experts.
Open →
Coming soon
Plant Wiki
Plant profiles, lighting, substrates, fertilisation and practical growing advice are coming soon.
Coming soon
Others
More aquarium reference topics, including equipment, water chemistry and invertebrates, are coming soon.
Articles
Long-form, practical writing based on real tanks.
Coming soon
Aquarium articles
Deep dives on aquascaping, water chemistry, stocking, plant care, and troubleshooting — what actually works, not what sells.
Tips & Tricks
Short, tested, practical shortcuts.
Coming soon
Aquarium tips & tricks
Field-tested tricks from keepers with 5+ years in the hobby — maintenance routines, planting hacks, and gear lessons learned the hard way.
Have a question or an idea?
Corrections, tool requests, and topics you want covered — we read every message.
Contact us