Hey Ranz,
Well only freshwater can evaporate.
Saltwater can LEAK, your salinity moniter (if it's a float arrow kinda thingy) can have an airbubble on it one time and not the next.
How are you mesuring your salinity??
As far as the calcium goes,,,,
Well kalk may keep your levels where they are but raising them to good levels will either require HUGE water changes or A WHOLE CRAP LOAD of calcium additive eg.marine calcium by seachem.
What is your alkalinity of your tank?
Your corals will not remain very happy at 300mg/l of calcium for very long.
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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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www.cakerybakery.ca
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