After trial and error, i've decided to use only 2 instead of 4 metal halide handing at about 2.5ft above water and reflected at an angle to the wall. Fishes behave and swim normally with this set up. Perhaps i'll use 4 x 150watt MH light again once i've set up a planted tank in the future and after the fishes are well acclimated to the lighting.
Intensity of 1 x 150watt Metal Halide when shining directly into the water.
Initially, 4 x 150 watt Metal Halide(10000k) lighting hang at about 1 feet above water surface. However, fishes look rather panic. My bigger RTG and other fishes only used to NAN light & PL light in my previous setup. My smaller rtg, i guess only used to FL light in the local fish shop.
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