one of my endi's died to day and yester day one of my dats in the same tank died. My water is great a few days ago I got a new pack of Seachem Purigen for this tank and some more blood worms I took the purigen out of the tank and I will go pick up some more blood worms tomarow. wich one do you think may of killed him? by the way he was about 6 inches