I got a big fat one and he stays out of the Niger's way but I am pretty sure he has eaten every pod and worm in the tank. 
I can see how it would be a problem with smaller fish. They are fast and feisty.
Better not put one in with that goby unless it is small.
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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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