Ive heard that tropic marin is THE BEST, its supposed to have all the trace elements found in natural seawater, the more of these elements the less you would ever have to dose your tank with supplements, and yes its made by zegermans in ze germany, ive used it and out of the 4 salts ive tried i liked it the best, dissolves really well and my corals at the time were very healthy. But I switched salts and slacked on WC's and lost most of them---plus I had pretty weak lighting and was a total newb so I dont know how much i could blame the salt for the loss. But on the flipside, when I was running with tropic marin everything was a ok even though my husbandry sucked!