You know I've always wondered how that works exactly. If you're usuing distilled or RO/DI water that is pure water and doesn't contain any trace elements, then how does it replenish your tank of those trace elements?Thanks for clarifying. I think sometimes when new reef keepers get into the hobby they feel they have to dose things because they read about it or get the newest gadgets. Sometimes it is best to just get a feel for how the system works as a whole and not get so hung up on one or two parameters.
Water changes with good seawater is all that is needed most of the time. This is true in smaller systems. After one gets a handle on the basics, then a person can get more in depth with certain species or types of tank to run.
JMO