i would think fish could survive without filtration for more than 12 hours in a 20 gallon tank. when the powere went out durring hurricane Ike my friend didnt have power for 3 days and only one fish died in his 40 gallon over populated cichlid tank. this doesnt sound right. i would suspect foul play or some kind of revenge. who was the person to lock the store up that night?duncan33;3406850; said:true that