Well the assassin isn’t bothering my nerite. He’s also.... vanished. Saw him for about three hours cruising around and haven’t seen him since.

Buried in the gravel, perhaps. Hopefully he’s finding the occasional mini ramshorn to snack on and keep him happy.
Unfortunately now three of my five bamboo shrimp have decided to take a walk and are no more. The tank does have a cover but they are obviously slipping out at the gap where the filter outlet is. I should put up a moat...
Interestingly, the two who remain are the two who seem amenable to syringe spot feeding. Perhaps the others weren’t able to get enough to eat without the spot feeding and sought greener pastures. I don’t think I’ll get any more, clearly there is something they don’t like about the tank, be it food supply or something else, and it’s quite sad finding them on the floor!