How long has your tank been up? Any pics of the rock work/tank? Can you confirm if the cuc did actually die?
It is a possibility that your rock is leaching out nitrates... If the bacteria died that could cause a spike but one would think that if that happened then other bacteria strains would thrive equaling out the imbalance.
How old is your tank, do you run bp or carbon dose?
A pic of the display and sump would help.
Also what is your feeding regimen and how much do you feed?
Skimmer size and info on tank specifications and equipment would help aswell.
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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