Fin & Filter is written by Scooter M., an enthusiast who is genuinely into this. I read the manuals, compile the published specs, and do the math. No lab coat, no test tank wall, no expert panel — and no pretending otherwise.
Why this site exists
A first aquarium fails in a predictable way. Someone buys a kit with a picture of fish on the box, sets it up on a Saturday, adds fish the same afternoon, and watches them die over the next fortnight. Nothing in the box told them that a new filter contains none of the bacteria that make a tank habitable, that growing those bacteria takes about a month, or that the invisible compound doing the killing cannot be seen, smelled or guessed at.
That is a solvable information problem, and it is almost entirely upstream of gear. So this site is organized as the five steps in the order a beginner meets them — the tank, the filter, the cycle, the stocking, the ongoing water care — rather than as a product catalog. The product recommendations exist because you have to buy something, not because buying something is the point.
What I claim, and what I do not
I have not tested any of the products on this site. Not one. I do not own most of them, there is no lab, and there is no wall of tanks running comparisons. Every gear site in this category says it tested twenty filters. I have tested none, and I would rather say so than write a sentence I cannot defend.
So the obvious question is why you would trust the recommendations at all, and the answer is that they are not opinions. Every pick is the result of taking the figures the manufacturer publishes and applying arithmetic that is printed in full on how we pick: the turnover a tank of a given size actually needs, the roughly 30% of rated flow you lose to media and head height in service, and the heater wattage required for your coldest realistic room temperature rather than for an average one. You can re-run any of it. If a pick is wrong, you can find the exact step where we diverge, which is not something a score out of ten lets you do.
- No credentials are claimed. No certification, no veterinary or biology qualification, no "reviewed by an expert". I hold none of those and will not imply otherwise.
- No first-hand testing is claimed. Every product page says so on the page itself, not only here.
- No reviews or testimonials are published. I have no verified reader accounts to publish, so there is no testimonials section anywhere on this site. An invented one would make everything else here worthless.
- No score, no stars, no rating — including in the structured data. A score is a summary of testing, and I have not tested anything.
Where the numbers come from
Specifications are quoted from the manufacturer's own product page, its manual, or a retailer listing that states a kit's contents. Those links are at the foot of every page that relies on them. Where a maker does not publish a figure, the page says the figure is not published — the common case being bundled kit filters and air-driven sponge filters, neither of which tend to carry an honest flow rating.
The underlying biology — why ammonia is toxic, why toxicity rises with pH and temperature, what the nitrogen cycle actually converts — is sourced to public documentation rather than asserted. The cycling pages carry those citations.
How the site pays for itself
Amazon commissions. When you buy through a link here, Amazon pays a percentage and you pay the same price you would have paid anyway. That is the entire business model at the moment: no sponsorships, no paid placements, no brand has ever been given a position, and no brand has seen a page before it published.
The obvious conflict is that we earn more when you buy more, and the honest mitigation is structural rather than a promise: every roundup names at least one product not to buy first — including products we would earn on — and the ranking criteria are published as arithmetic you can check rather than as a judgment you have to trust. The full detail is on the affiliate disclosure and the editorial policy.
Corrections
If a specification here contradicts the manufacturer, or the arithmetic on a page is wrong, that is worth telling me about and I will fix it and note the change. This is a young site working from published documents, and published documents get revised. Email is below.
Who publishes it
Fin & Filter is published by Slate Mill Group. It is a national publisher rather than a shop: there is no storefront, no premises to visit, and nothing is sold or shipped from here. That is also why you will not find a phone number or a postal address on the site — inventing one to look established would be the same failure as inventing a testimonial.
The way to reach us is email: info@finandfilter.com, or via the contact page. Questions about a specific tank are welcome and are the main source of new page ideas.