tank is over a year and half old
the hard corals that died have been in there for over 5 months
all my parameters are good (or so i thought)
pH = 7.9
Ammonia = 0
nitrate = 0
nitrite = 0.1
phosphate = 0
calcium = 380mg/L
yah all my fish are good,
soft corals are fine
just the hard corals all died very quickly.
i looked it up on the net and it sounds like
Rapid Necrosis.
anyone else had or know of this?
in terms of changes:
i did add a neon dottyback
and some porcelain crabs that didn't make it.
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