They can turn brown for a bit I had some do that but turn back later on after they get used to your tank.
I find acros to do this a fair bit more so than monti's.
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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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