Thank you so much, all.
Are you thinking in general or something about this fish made you think so? The odd left and right hand side spotting?
Gotcha. Much appreciated, mate!
I asked Wesfugupuff about this batch, IIRC he said there is nothing unusual he noted about it or heard back from customers. One guy lost the whole group too but it sounded like to his own error.
Maybe Wes knows more now than back in Aug-Sept 2016 when I was reporting my gradual losses to him? I am not sure he will have the time / chance to chime in but hope so. I tend to blame myself anyway, I know my nitrates have been creeping up on unsuspecting me back then...