Quote:
Originally Posted by ScubaSteve
Calcareous corals can incorporate strontium into their skeletons, hence with the Sr levels will deplete over time.
Daniella, if you can, see if he can test some of your freshly mixed water before a water change. I'd be curious to know if the Sr levels are already low in your salt mix, which would give you consistently low readings. We might be able to pinpoint what is using it the most.
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+1. Many salts skip on proper levels of such elements. Maybe because of their expense? Or to keep the market of the trace elements alive?