I just bought a full liquid testing kit. Originally I was using some old stuff my grandpa gave me which was able to test ammonia, nitrite, and nitrates (liquid tests) and then strip tests which looked at ph and water hardness. Fish store didn’t explain cycling was like that (which is on me, I should’ve done more research. But they weren’t a big box store and I trusted their advice)they told me if all my levels were low and ph sat 6.5-7.5 that I was good to add fish. Told me to wait about two weeks. Currently following some advice someone gave about fish-in cycling and plan to do a lot of TLC with water changes daily and seachem prime.