I had previously 2 fish in a smaller tank, I got a new tank I chlorinated and did a zyme and ph tablets, and let my tank run fish less for 24 hours and got a heater and had it heating to the right temperature. So after I got 5 fish to add into it, with my 2 previous fish, I acclimated them all and added them in there after 20 minutes. I came back in 4 hours and my tank was all cloudy, and 2 of the fish were dead, and all the rest were at the very top of the tank acting all funny and then another died. So I switched to a smaller tank I had and gave it new water and acclimated them again to it, and then in the morning they acted normal, but I left the other aquarium running all night and its still cloudy. Please help I did a ton of research and all I can find is new tank syndrome, and ammonia, but would they die so soon?