He climbs to the top of the glass, spreads himself out, and floats around upside-down on the surface. A tetra bumped him, and he curled up and sank to the bottom, so he definitely wasn’t stuck up there. The second he hit the substrate he went right back to the glass and did it again.
Why? Whats his deal? We have a handful of assassins and none of the other ones are doing this. He only does it when the light is on.
Maybe it discovered floating detritus or food and now lazily floats about munching instead of being a gravel and glass sucking cavesnail?
Well hes SUPPOSED to be eating the ramshorn snails. Not very good at it, though.
I’m not going to say he is trying his best, but he is living his best life and I think that should be enough for anybody.