You're welcome very much! Remember this, when you have a tank with only a few mixed corals where very few of them are stony corals LPS or SPS you most likely don't need to dose anything or in most cases even check your water parameters. I no longer check mine because I know a wc will fix it in most cases. Now if the wc doesn't fix it I'll pull out the test kits and see what my readings are, but for the most part I don't test anything.
You can do a 20% wc weekly to get your params in check then go to a 10% every two weeks and see how that does for you. You might need more or less depending on your tank. I'm in the figure out the new 40b over my 20L that it replaced.