Hello to all forum members, my corals do not look good, so I bought test kits for a lot of money. Alklinity and phosphate I bought Hannah, calcium and magnesium, Salifert and nitrate and nitrite from Tropic Marin. I saw endless YouTube videos in English and read and did everything, but each video shows things differently and I'm not sure already how to test, this thing is very important to me to diagnose the problem in my aquarium, I can not perform tests accurately, each video has different tips but even One does not explain clearly enough for me, I have no knowledge of English at all and everything is so difficult for me