I’m about to purchase the test kits needed for my planted aquarium. What are the minimal tests required for a healthy tank? I don’t need/want to test needlessly. I am purchasing a test kit for gh, kh, pH. I don’t think testing for iron is necessary. What about testing for ammonia, is it necessary? What else do you recommend?

Also what are reputable test kits that you like or trust?

Thanks for your input.
Dan