8 products
Water Conditioners & Additives
making tap water safe to put in a tank
Dechlorinators, bottled bacteria and clarifiers, with what each one is for and what none of them can do. Dose everything by the manufacturer label.
Index
Equipment, and What It Cannot Do
Six categories, described by the job they do rather than by how they are marketed. One of them is genuinely non-optional, one measures the room rather than the tank, and one comes with more caveats than sales copy.
6 categories · 33 products
Products live here rather than scattered through the troubleshooting pages, and a fix links to a category only when that fix genuinely needs a thing. Most do not. A water change, a shorter photoperiod and a lighter hand at feeding time cost nothing and solve more of what brings people to this site than anything on this page.
Everything below is described from the retailer’s listing. There are no prices, no ratings, and no claims about testing we did not do. Where a listing makes a claim, it is attributed to the listing rather than restated as fact.
2 products
Filters
turning water over and housing the bacteria
A filter does three jobs at once and only one of them is making water look clear. What to match to your tank, and why rated flow is a ceiling.
9 products
Filter Media & Cartridges
what actually does the filtering, and when it gets replaced
Cartridges, foam and chemical media, and the replacement habit that keeps a biological filter alive. Stagger changes and rinse in tank water only.
2 products
Test Kits
knowing the number instead of guessing it
Liquid kits and strips, what each is good at, and the handling errors that produce most wrong readings. Every fix on this site starts with a number.
8 products
Room Temperature & Humidity Monitors
watching the room the tank lives in
These devices measure the air in the room, not the water in the tank. What that is genuinely useful for, and what you still need an in-tank thermometer for.
4 products
Decorative Stones & Pebbles
looks, with the caveats stated plainly
Decorative pebbles sold for planters and vases. None of these listings claims the rock is inert, and checking what a bag does to your water is the buyer job.
The categories at a glance
| Category | Core job | Products | Subgroups |
|---|---|---|---|
| Water Conditioners & Additives | making tap water safe to put in a tank | 8 | Dechlorinators, Bacteria and clarifiers, Medications — label use only |
| Filters | turning water over and housing the bacteria | 2 | None |
| Filter Media & Cartridges | what actually does the filtering, and when it gets replaced | 9 | Cartridges, Foam and chemical media |
| Test Kits | knowing the number instead of guessing it | 2 | Liquid kits, Strips |
| Room Temperature & Humidity Monitors | watching the room the tank lives in | 8 | None |
| Decorative Stones & Pebbles | looks, with the caveats stated plainly | 4 | None |
Three things worth knowing before you buy
- Room temperature and humidity monitors measure the air in the room. They are not aquarium thermometers and cannot report water temperature. See Room Temperature & Humidity Monitors.
- Decorative stones are sold for planters and vases. None of the listings claims the rock is inert, and checking whether a particular bag changes your hardness is the buyer’s job. See Decorative Stones & Pebbles.
- One product in the conditioners category is a medication. It is kept in its own group, described only as the listing describes it, and recommended nowhere on this site. Dosing and indications come from the label and from an aquatic veterinarian, never from here.
About the products on this site
Do you test any of this equipment?
No, and nothing here claims otherwise. Every specification is described from the retailer listing, and the phrasing keeps that attribution visible. What this site can speak to with confidence is water chemistry, filtration and maintenance, and that is where the troubleshooting pages spend their effort.
Why are there no prices or ratings?
Prices change constantly and a stale figure is worse than none. Ratings tell you about a listing rather than about a product. What is here instead is what each thing is for, what its listing states, and what it will not do — which is the part that is stable over time.
Why do so few troubleshooting pages recommend a product?
Because most aquarium problems are maintenance problems. Cloudy water, high nitrate, algae and surface film all respond to a water change, a shorter light period and less food, none of which cost anything. A page that sold you a bottle for those would be selling you the wrong thing.
What is the one thing I actually need?
A water conditioner, if your tank is filled from a municipal supply, and a test kit. Everything else depends on the tank. The conditioner is non-optional because tap water is disinfected on purpose and that disinfectant harms both fish and the bacteria in your filter.