I have a GHL doser that I'm using to dose DKH, CA, and MG. What would be the best use for the currently empty 4th doser? Some have suggested Acro Power, and I'm looking for what might be best for a mixed SPS/LPS reef tank. Needs to be something that wouldn't require stirring and I could pour a little more than gallon in the container at a time. Could also switch off periodically. What would you suggest, and why. Thanks. JP



