Your data, and how we handle it

🔒 Your cycle log stays on your device

When you track your tank's nitrogen cycle in the cycling tracker, each ammonia / nitrite / nitrate reading you save is stored only in your own web browser (using a feature called local storage). It's your tank's own cycle history — and it is:

• Kept on your device — no account and no server holding it, so it never leaves your hands.
• Yours, and private — it's your tank's own history to keep an eye on, not something we look over.
• Yours to remove anytime — clear it in the tool or clear your browser's site data, and it's gone.

Because it lives in one browser on one device, it won't follow you to a different browser or phone — and clearing your browsing data will erase it. That's the trade for keeping it entirely in your hands.

Email — only if you ask for it

If you choose to join the shoal and sign up for our email updates, we collect the email address you give us, so we can send the freshwater care content you asked for. That's the only personal detail we ask for, and only when you opt in.

• Our email list is managed by Brevo (Sendinblue SAS, an EU company based in France), which stores your address and the page you signed up from (such as which species or kit), may record whether our emails are opened or clicked, and sends our emails on our behalf; we don't pass it to anyone else.
• Every newsletter has a one-click unsubscribe link, and you can also reply to any of our emails (or write to hello@finfern.com) to be taken off the list — leave whenever you like.
• We use it to send helpful care content — never to sell you out or hand your address to third parties.

Hosting & basic technical data

Finfern is a fast, static website served through Cloudflare. Like any website, its servers automatically process standard request information (such as your IP address and browser type) to deliver pages and keep the site secure. We don't use this to build a profile of you.

Cookies & tracking

On this website, Finfern does not use advertising cookies or cross-site tracking, and we don't run third-party analytics that profile you. The only thing we store on your device is your cycle log described above — which is for your convenience, not our surveillance.

What we never do

• We never sell your data.
• We never share it for third-party advertising.
• We don't require an account to read our guides or use our tools — access is never gated behind a login.

Your choices & your rights

You're in control: you can clear your on-device cycle log at any time, and you can unsubscribe from our newsletters with one click (or reply to any of our emails and ask). Depending on where you live, you may also have the right to access, correct, or delete any personal data we hold (in practice, if you've subscribed, that's your email address, the page you signed up from, and whether our emails were opened or clicked). To make a request, or to ask anything about your data, email hello@finfern.com and we'll help.

Children

Finfern is a general-audience fishkeeping site and isn't directed at children. We don't knowingly collect personal data from children; if you believe a child has sent us their details, contact us and we'll remove it.

Changes to this notice

If our practices change — for example if we ever add optional accounts that sync your cycle log across devices — we'll update this page and the "last updated" date above before that change goes live, and describe exactly what's different.

Latest change: our email provider is now Brevo (it replaced EmailOctopus).

📧 Questions or requests: hello@finfern.com · more on who we are and how we fact-check.