Thanks John
I didn't intentionally lower it , it dropped that low overnight can't understand why as the group were together for 4 weeks
Also the night before the deaths I didn't feed the group as I was working late and lights were out when I got home So it wasn't over feeding

Hi thanks for the reply the tanks been running about 8 months I waited a white for it to cycle The ph was at 7.6 when I had the first 5 in then it crashed to 6.4 when the next 4 were added(possibly due to the extra waste acidic) I fed them a crushed thumb nail size of tetra prima 6 nights a week (si...

Help I've just lost 7 zebs don't know why !! I had a group of 9 .2 separate batches a 5 and a 4 all F1 about 1.1/2 to 2 inch TL Group 5 I had for 3 months fed on new era pellets all well blue tinges fat bellies Group 4 bought 4 weeks ago they were fed on tetra prima granular Tank params temp 84'f ph...