What you type into the calculators
The calculators run in your browser. Tank measurements, personal electricity rates and purchase amounts are not submitted to a server. Some tools have a button that copies a link to your result: that link holds what you entered, such as measurements, fish or costs, so anyone you send it to can see those entries. Nothing is shared unless you copy and send the link yourself. There are no accounts or tank profiles shared between devices.
Analytics and cookie choices
Plausible counts every visit without cookies. It may receive browser and device information and a referring page.
Google Analytics is run by Google, which receives the page address, the actions we measure on this site and browser and device information, and sets cookies that tell repeat visits apart. Its advertising features are off.
In the European Union, Iceland, Liechtenstein, Norway, the United Kingdom and Switzerland, and whenever we cannot tell which country a visit comes from, Google Analytics loads only after you choose Accept on the bar at the bottom of the page. Decline loads nothing from Google. Your choice is kept in this browser for six months, then the bar asks again.
Elsewhere, Google Analytics loads with each page unless you choose Decline. Cloudflare, which delivers our pages, tells your browser which country the visit comes from.
Wherever you are, Cookie choices at the bottom of any page, or the button below, changes your choice. Decline stops Google Analytics on this site in this browser and deletes its analytics cookies. If analytics was running, the page reloads to apply your choice. Decline holds on every page; outside the countries above it is kept until you change it.
Tool events use fixed action categories. They do not include tank measurements, personal electricity rates, purchase amounts or contact messages.
Third parties that can receive request data when you use this site: Google Analytics and Plausible as described above, Amazon when a product photograph loads or you follow a retailer link, and the manufacturer whose page you open from a source link. If a display advertising network is added later, this page will name it and describe its consent mechanism before the first advertisement appears.
Retailer links
Retailer links on this site are affiliate links: they carry a tracking code so the retailer can attribute the referral and pay us a commission. As an Amazon Associate I earn from qualifying purchases. It costs you nothing extra and it changes no recommendation here.
Amazon product photographs load directly from Amazon and link back to that product’s own Amazon page, as the programme requires. Amazon receives your IP address and normal browser information when a photograph loads.
External links and product images
Manufacturer and merchant links open external websites whose own privacy rules apply. When a licensed Amazon image is displayed, your browser requests the image from Amazon’s image service. Amazon receives the connection information needed to serve an image, including your IP address.
Contact messages
The contact form sends your report, your reply address, your name if you give one, and any page or source you add through Cloudflare, which runs an automatic security check that never asks you to solve anything.
We keep each report in our contact inbox at Cloudflare for 12 months, then it is deleted automatically, and a copy goes to a private Discord channel our team reads. We use your reply address only to answer you, never for marketing. To see or delete a report you sent, ask through the same form and we will delete both copies.
Cloudflare Turnstile checks for automated submissions and receives browser and connection information. Do not include passwords, payment details or other sensitive personal information in a report.