He was just lying on the bottom, not really moving very much. He did move when I tried (gently) to catch him in the net, to see if I could see anything physically wrong… and then he went back to being listless.
He died this afternoon.
I wonder if it was thanks to whatever killed the tetra? He certainly didn’t look the same as the tetra had. His belly may have been distended – although it wasn’t dropsy – and there may have been something wrong with an eye… although this could also just me being paranoid.
I’m very sad. Ammonia and pH are fine.