First thing you will have problems with on an overstocked tank is algae usually hair. Just make sure you do your water changes regularly, and some of the other suggestions posted would help your tank that much more. 
Box/Cow fish release toxin when they die and can wipe out your hole tank just food for thought. I would think 75-90 min for the Trigger/Puffer combo depending on what kind.
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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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