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Yes, if there is a source of ammonia your tank will cycle, even if you do 25 or 50% water changes every 3 days.
If it where me, and I could only buy one test kit, I would buy an API liquid test kit for ammonia.
PH does not usually fluctuate much, so you can take some of your tank or tap water to the fish store with you and let them test your ph for free.
Remember that if you are cycling and you start getting zero readings for ammmonia, you more than likely still have high nitrites and should continue with the frequent water changes.
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