I have more or less the same fish with the same problem.
Try feeding more and really driving the food down to the bottom of the tank.
That worked for me after they get more settled they will come up, but in my tank they still only come up half way.
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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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