Planted Tank Enthusiast
Join Date: Dec 2016
Location: CT River Valley, CT, USA
I think you'll be fine. As long as you don't touch your filter media, you shouldn't cycle at all.
I did exactly what you're talking about, except I did it with a 125G tank and it took me 9 days. I checked my water 2x daily for the first few days because I was paranoid, but I never got any ammonia.
For an emergency backup plan, just keep a full bottle of Prime on hand. Prime will bind up ammonia for 24 hours, so if you get an ammonia reading, do a 50% water change and dose the tank with prime. Check it at the same time the following day, and if you have ammonia, rinse and repeat.
With a cycled filter, any mini cycle should be over quickly, and can be handled with water changes and Prime.
If you ever think you're too small to make a difference, spend a couple of nights sleeping with a mosquito.
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