This is a specific conversation about Fish aquarium setup — getting started right — ask about yours and get one honest answer for your exact situation.
inparticular.ai
Switching from the API Master Kit to Salifert mid-cycle is a smart instinct — a lot of fishkeepers make that jump once they realise how much the API kit can underread, especially nitrite at higher concentrations. Before I compare them properly, can you tell me where you are in the cycle right now? Are you seeing ammonia, have nitrites appeared yet, and are you cycling with fish or fishless?
Fishless cycle, about two weeks in. I'm dosing ammonia to 2ppm but I'm not sure the API kit is reading it accurately — the colours are really hard to distinguish. Nitrites have just started showing up. 200 litre tank, planning to keep a community of tetras and corydoras.
inparticular.ai
Two weeks in with nitrites appearing is exactly where you want to be — your cycle is progressing well. Your suspicion about the API ammonia colours is completely valid. The API colour chart is notoriously hard to read in the 0–0.5ppm range, which is precisely where you need precision towards the end of a cycle when you're confirming ammonia is dropping to zero. Salifert is a meaningful step up in readability, particularly for ammonia and nitrite.
So Salifert is actually more accurate, or just easier to read? And is it worth buying individual Salifert tests or a bundle?
inparticular.ai
Both, honestly. Salifert uses a different reagent chemistry that produces a cleaner colour change with less ambiguity — it's not just a prettier chart, the test itself distinguishes low concentrations more reliably. For cycling a freshwater tank you need ammonia, nitrite, and nitrate. The individual Salifert Profi-Test kits for each are the ones to get — they're well-regarded by hobbyists precisely for this. I'd recommend picking up the Salifert Profi-Test Ammonia, Salifert Profi-Test Nitrite, and Salifert Profi-Test Nitrate separately. The ammonia one is the priority right now given where you are. They're all available on Amazon UK and each tub does around 50 tests, so they'll last you well beyond the cycle.
Does Salifert do a freshwater ammonia test, or is it mainly for marine? I've seen people say it's a reef product.
inparticular.ai
Good question — Salifert is rooted in the marine hobby but their ammonia, nitrite, and nitrate Profi-Tests work perfectly in freshwater. The chemistry doesn't care whether there's salt in the water for those three parameters. The only Salifert tests that are marine-specific are things like alkalinity, calcium, and magnesium — nothing you need for a tetra and cory community. You're fine to use them on your 200 litre freshwater setup.
Perfect. Should I keep the API kit at all, or just replace it entirely?
inparticular.ai
Keep the API pH test — it's fine for pH and Salifert doesn't do a standalone freshwater pH kit worth bothering with. For ammonia, nitrite, and nitrate though, retire the API versions and use Salifert going forward. Once your cycle completes and you add your tetras and corydoras, the Salifert nitrate test in particular will give you much cleaner readings for your weekly maintenance checks. You'll stop second-guessing your results, which makes the whole hobby less stressful.
