about a week ago i got a smokin deal on 2 8 inch bala sharks, after 5 days in a qurantine tank i put them in my community tank. later that night i noticed 1 of the bala's with his mouth open and he never seemed to shut it, it almost looked stuck open. so this morning i found my pleco and cray feeding on the dead bala. they pretty much finished him off but i pulled out the remaining parts of the bala. so my concern is im not sure what killed the bala and now fear that the pleco and cray may be at risk for sickness!