Ammonia not dropping after 2 weeks? Fix your cycle

Two weeks in with ammonia still not dropping — that's frustrating, but it's actually a really common sticking point and usually fixable. Before we dig in: are you testing with liquid drops or test strips, and have you added anything to try to kick-start the cycle — like bottled bacteria, fish food, or ammonia? Also, is the tank fishless, or do you have fish in there already?

That's really helpful — and honestly, the test strips are likely your first problem. They're notoriously inaccurate for ammonia, often reading 'high' when the actual level could be anywhere from 0.5 to 4 ppm, which matters a lot. If you're getting vague readings, you can't actually track cycle progress. The other issue is that goldfish are heavy waste producers, so in a 60 litre tank they're generating a lot of ammonia before the beneficial bacteria have established. You need to know exactly where you are before deciding what to do next.

Yes — get the API Freshwater Master Test Kit. It uses liquid reagents, not strips, and gives you precise readings for ammonia, nitrite, nitrate, and pH. It's the standard kit most serious fishkeepers use, and it'll tell you exactly what stage your cycle is at. On your second question: yes, you can cycle with fish in, but you have to manage it carefully. Once you have accurate readings, if ammonia is above 1 ppm you'll need to do partial water changes — around 25 to 30 percent — to keep the fish safe while the bacteria catch up. You're not failing the cycle, you're just flying blind right now.

The cycle is complete when you can see the full sequence play out: ammonia rises, then drops to zero as nitrite rises, then nitrite drops to zero as nitrate climbs. When you're consistently reading zero ammonia, zero nitrite, and some nitrate — usually somewhere between 10 and 40 ppm — you're cycled. With goldfish producing waste continuously, you might also want to add a bottle of Tetra SafeStart Plus alongside the test kit, which introduces live nitrifying bacteria and can shorten the remaining cycle time significantly.

Good call. Test first thing in the morning before feeding for the most accurate reading — ammonia tends to be highest overnight. Once you've got a few days of data, you'll be able to see whether things are moving in the right direction. Goldfish are resilient, but catching a spike early makes a real difference. You're on the right track now.