Doing a fish in cycle is not simple, it is not a good way for new fishkeepers to go. You will need to learn about NH3 and NH4 and how to calculate them from your test kit ammonia reading .
How to Cycle a Fish Tank Without Fish. Fish-In Cycling: What to Do If You Already Added Fish.Fishless cycling means you cycle the aquarium without fish inside. This is safer because no fish are exposed to ammonia or nitrite while the bacteria colony grows. The basic idea is simple.
Fish Care, Nutrition and Water Management. Tank without Filter and Air Pump.Just buy a small hang on filter and cycle the tank first. HOB filter not cost much and use some of ur established tank's filter media to speed up the cycle.

This particular example perfectly highlights why Cycling A Small Fish Tank Without Filter is so captivating.
Smaller tanks without a filter may need as much as a 50% water change every other day. If you have a larger tank with a filter, changing out 10-25% of the water every week should be excellent.
Why Tank Cycling is Better. Cycling your aquariums provides a significantly more stable environment for your fish greatly reducing the likelihood your fish will contract diseases due to stress.

Without it, your fish could suffer or worse. This guide will break down the aquarium cycle in simple terms and help you avoid beginner mistakes that lead to toxic water and stressed-out fish.
AQUANEAT Fish Tank, 1.2 Gallon Aquarium, Small Betta Fish Tank Starter Kit with LED Light and Water Filter Pump, Rectangular.

To cycle a fish tank without fish, introduce ammonia in the tank (up to 5 PPM) then maintain the ammonia level.The size of the fish tank is indirectly related to the nitrogen cycle. You should not choose a fish tank that is too small for the fish you are going to keep in it.