so by the sounds of it a $20 barred at 10" would be a good pick up. would you try it with a 7 1/2" tiger oscar and a 9" albino tiger oscar in a 500 gal. with a 10x5 footprint? the lfs said it is a mean sob and kills everything in the tank with it, only a 75-90 gal tank though. think they would have enough room for it to leave them alone?