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A week ago i bought 4 tiger barbs n from the time i bought them they stay in 1 corner of my 120 gallon tank all day, its only when i put off all the lights at night that thay start swimming around the tank, i really dunno wats wrong ??? i have 4 kribensis, 2 bala sharks, 1 pangasius shark, 1 gourami, 1 pike-nosed gar, 2 swordtails, n inserted my betta yesterday. R tiger barbs nocturnal? Or are they being threatened in some way?