questions bout RTN

Im SpSing

New member
Hey all,

I need some questions answered as soon as possible. Can low nutrients, i mean really low, cause rtn. What about a crazy long photoperiod, say 18 hours roughly? ( timer broke) :( Which is the most possible cause?

If it's the nutrients then im getting some sand tonight b/c my sps are starting to rtn and my 29 gallon is being skimmed by an ASM-g3.
 
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