Im the one with 15 gallon saltwater tank and i had it from more than a month i did use a domino damsel for cycling but everything was fine but today i woke up and i found it dead i checked water and my results are ph 8.5 nitrite 0 nitrate 10 i added a black urchin and 2 crabs from 1 week ago it's possible that black urchin killed my domino damsel ?
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