So my tank has been up and running for a few months now, all coral,fish,clams etc. Have been happy and water has been exceptional. Last night I noticed a major spike in nitrite levels (0.0 jumped up to 0.75) only change made was I started dosing with phyto-feast per instructions on the bottle. Can overdosing have caused my spike? Also my corals have retracted and not came out since the spike. And clams have started to expell a mucus type substance. Attempting to do a 50% water change ASAP. What else can I do to help my tank and if not the phyto-feast what could have caused the sudden spike?


