ist not that you need them..... you already have them.
most people just use water changes to replenish trace minerals, that being said dont add anything.
alot of people dont add iodine. its hard to test for and can easily be over dosed.
In my opinion just stick to water changes for now. Test for Calcium and ALK once a week. If water changes are unable to keep your Calcium above 400 and your ALK above 3.0Meq/L then you'll need to start dosing them. This probably won't happen until your Coral load increases.
