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I Don't Want To Speak Too Soon, But Does This Mean...


kazaba

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The tank in question is a 40 gallon long, has a penguin 350 filter (350gph, almost 10x), and currently holds my two small goldfish. I added the fish 10/11.

So I did a 50% water change two days ago, readings were (before water change):

Ammonia = 0

Nitrite = <0.25

Nitrate = 5-10

I tested the water the next day (only ammonia and nitrite):

Ammonia = 0

Nitrite = slight ( very slightly darker blue for the API drop test kit)

And today... (only ammonia and nitrite again):

Ammonia = 0

Nitrite = 0!

So how long after a water change can I be certain that the tank is cycled? :D

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So how long after a water change can I be certain that the tank is cycled? :D

So far it's looking pretty good, Kailey! It's been a little over 30 days and your ammonia and nitrites are showing zero which is a great sign. After doing a water change keep checking your parameters daily. Having two fish in your tank with zero nitrites and ammonia for a solid seven days will tell you. But it sounds like it is cycled, but again in my experience give it a seven day period and with no spikes you can relax and say whew! ;)

Nice job!

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