I keep minnows alive in a 100 gallon tank. I usally use some stuff in a yellow bottle from Wal-mart to take the chlorine out of the water. Tetra or something its called. It is clear. It works really well but is kind of expensive. I bought some of that blue better bait minnow holding formula to try out. I try to measure it just like the bottle says but I have killed my minnows three times. I have never killed them with the Wal-Mart stuff. I noticed after I changed the water last and added the better bait the minnows were at the top. The next morning they were all dead. Any suggestions?