My juvinile arowanas tail has been completely bitten off anal and dorsal fins nipped and damage to scales aswell had him since saturday been completely fine til i woke up this morning and found him like this what do i do, hes around 4-5" in a tank with a 2" jack dempsey, a 2" electric blue acara, a 1 1/2" nimbochromis polystigma, a 3" columbian shark and a 5" australian redclaw crayfish