Terms of Use and Disclaimer
Last updated September 28, 2026
GoodFishTank (goodfishtank.com) is run by Manel Vadillo, an individual based in Andorra. By using the site you agree to these terms. If you don't agree, please don't use it.
Information only, not veterinary advice
Guides and calculators are general information for hobbyists. They aren't veterinary, medical or professional advice, and they can't account for every tank. Fish, water and equipment vary. If a fish is sick and basic care hasn't helped, contact a veterinarian who treats fish.
Calculators
Calculator results are estimates based on the inputs you give and the formulas shown on each tool. Product concentrations and labels change, and test kits have limits. Always check the label on your product, start with less rather than more, and confirm results with your own water tests.
Chemicals and equipment
Some guides involve ammonia, water conditioners, medications and electrical equipment such as heaters and filters. Follow the manufacturer's instructions and safety warnings, keep chemicals away from children and pets, and never mix products unless the label says it's safe.
Accuracy
We check figures against their sources before publishing and show the date each guide was last reviewed. Even so, sources can be wrong or go out of date, and we can make mistakes. We don't guarantee the site is complete, accurate or current. If you find an error, please tell us.
Links to other sites
We link to sources and, in the future, to retailers. We don't control those sites and aren't responsible for their content, products or privacy practices.
Copyright
Text, calculators and diagrams on GoodFishTank are © Manel Vadillo. You may quote short passages with a link back to the page. Please don't republish whole guides or copy the calculators.
Photos belong to their authors and are used under the license credited with each photo (for example CC BY or the Pexels License). Those licenses, not ours, govern reuse.
Limitation of liability
The site is provided "as is", free of charge. To the extent the law allows, Manel Vadillo is not liable for any loss or damage arising from your use of the site or reliance on its content, including loss of livestock, plants or equipment. Nothing in these terms limits liability that can't be limited by law.
Governing law
These terms are governed by the laws of the Principality of Andorra. This doesn't take away any rights you have under the consumer laws of the place where you live.
Changes
We may update these terms. The date at the top shows the latest version.