Originally Posted by SwimsWithFish
And that's why it's ideal to do smaller more frequent water changes. By the time you hit the one week mark your corals have probably used up all the trace elements so it's probably a good idea to get a test kit and dose calcium, iodine,ect. But with 10% weekly you don't really need to dose.
Yes and no. I agree its better to do smaller more frequent PWC
's, but I doubt that unless your tank is LOADED with corals they're consuming enough trace elements that it would require dosing in less than a week. I do agree that if you are going to dose you should definatly be testing. Also, to generalize everyones tank needing 10% weekly isn't always going to be accurate. A tank with only a few corals will need less than a tank loaded with sps
. You have to look at what is in your tank, determine what their needs are and go from there.