I have four tiger barbs I tried getting another from petland after an employee at PETCO suggested I get five to insure they don't fight and have a proper pecking order well the dumb ***** at petland beat the poor fifth fishes head against the side of the tank about a hundred times while he dangled by two little fins entrapped in the net then stands back and says there u go he look good, I said okay fearing the fate of the others had I asked her to fish out a different one. Of course the fifth fish died I'm sure from traumatic head injuries within a few hours leaving me with four again (I'll never go back to petland) should I be worried about not having an odd number of them the four seem just fine besides the occasional flashing against the sand which is very seldom once every few hours slightly more only during feeding time they look healthy no signs of anything wrong and have been for a while should I go back for another not from pet land and any advice on the flashing?