Thats a lot of fish for a 90 are you sure you have no NO3
I only have 3 fish small ones in my 75 and I show 0.2 of NO3
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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