Here is a question? I like to feel like I'm doing something with the tank all the time. Not really put my hands in it but testing, cleaning the sponge,glass, skimmer. I just finally got rid of my cyano on the sand bed and tank looks good to me. But should I experiment with vinegar dosing just because I would be doing something or how do you know when to carbon dose? Only when nitrates are too high and can't bring down through water changes. My nitrates are less then 5ppm