Temp is 25 degrees Celsius must be some chemicals in the water but no idea what. The fish are healthy and fine, the 2 x Mexican crabs are fine, the 2 x really small rock crabs are fine the snails are dead and have been removed. The shrimps are dead and been removed. The 4 x red leg hermits 2 x large and 2 x small are still alive as they regularly go in and out of their shells and occasionally move less than a cm at a time in a week none have moved more than a 2cm in total. Nobodies what's going on. Tested for all usual stuff.
Think that's about all I have tests for
. I have read loads now but nobody seems to have this problem. I drip acclimatised them really carefully and slowly.