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Privacy Policy

Last updated September 28, 2026

The short version

  • No cookies. This site doesn't set any cookies, first-party or third-party.
  • No analytics, no ads, no tracking. There are no analytics tools, advertising scripts, social media widgets or embedded videos.
  • No third-party requests. Pages, images and fonts are all served from goodfishtank.com. Your browser doesn't contact anyone else unless you click a link.
  • No accounts or forms. The calculators run in your browser and don't store or send what you type.
  • The only personal data we handle is the technical data our host needs to serve the site, and any email you choose to send us.

Who is responsible

The data controller is Manel Vadillo, an individual based in Andorra, who runs GoodFishTank alone ("we", "us"). Contact: hello@goodfishtank.com.

As the controller is based in Andorra, this policy follows Andorra's Qualified Law 29/2021 on the protection of personal data (Llei 29/2021, qualificada de protecció de dades personals). The site is written for readers in the United States, so we also cover U.S. state privacy rights below.

What we collect and why

Hosting logs

The site is hosted by Vercel Inc. (United States). To deliver pages and protect the site from abuse, Vercel processes technical data for every request: IP address, browser and device type, the page requested, the referring page and the time. We don't combine this with anything else and don't use it to identify you. Vercel acts as our service provider under its own privacy policy.

Legal basis: our legitimate interest in running a working, secure website.

Email

Mail to hello@goodfishtank.com is forwarded by our domain registrar, Namecheap, Inc. (United States), to the owner's personal mailbox. We keep your address and message only as long as needed to reply and follow up, and delete them on request. We never add you to a mailing list.

Legal basis: your request, and our legitimate interest in answering it.

Calculators

The calculators run entirely in your browser. The numbers you enter aren't sent to us, stored in cookies or saved in your browser's storage.

Links to other sites

Guides link to sources such as government agencies, universities and manufacturers. Once you click through, that site's privacy policy applies.

Transfers outside Andorra

Vercel and Namecheap are U.S. companies, so hosting logs and emails may be processed in the United States or other countries where they operate. We rely on these providers' contractual and security commitments for that processing.

How long we keep data

  • Hosting logs: kept by Vercel under its own retention rules. We don't export or store them.
  • Emails: until the conversation is over and no longer needed, or sooner if you ask.

Advertising (Google AdSense)

Not active. There are no ads on this site today and no advertising cookies.

We plan to apply to Google AdSense later. Before any ad is shown, we will update this section and the date at the top of the page. It will then explain:

  • That Google and other vendors use cookies to serve ads based on your visits to this and other sites.
  • How to opt out of personalized ads (Google's My Ad Center and aboutads.info).
  • That visitors from the European Economic Area, the United Kingdom and Switzerland will be asked for consent through a Google-certified consent tool before any ad cookies are set.
  • How we honor Global Privacy Control and opt-out requests from U.S. visitors.

Affiliate links

There are no affiliate links on the site yet. When we add them, the retailer you click through to (for example Amazon or Chewy) may set its own cookies on its site to credit the referral. Pages with affiliate links will say so near the top. See the affiliate disclosure.

Your rights

Under Andorran law you can ask to access, correct or delete your personal data, restrict or object to its processing, and receive it in a portable format. Readers in the European Economic Area and the United Kingdom have similar rights under the GDPR.

Depending on your U.S. state (for example California, Colorado, Connecticut or Virginia), you may have the right to know what personal information is collected about you, to have it deleted, and to opt out of targeted advertising or the "sale" or "sharing" of personal information. We don't sell or share personal information.

To use any of these rights, email hello@goodfishtank.com. We may ask you to confirm the request comes from you. You can also complain to Andorra's data protection authority, the Agència Andorrana de Protecció de Dades (APDA), or to the authority where you live.

Children

This site isn't directed at children under 13, and we don't knowingly collect their personal information.

Changes

If this policy changes, we update the date at the top. Material changes, such as turning on ads, will be made here before they take effect.