I got half a dozen dwarf chain loaches to compliment my 6ft community tank… And the stupid things have spent more time in the weir and the sump than they have in the tank.
I literally just fished three of them out of the sump, and the second I put them back in the tank one went directly to the overflow and straight in to the weir again. At some point it’ll reappear in the sump.
I don’t even think they’ll grow big enough to stop being able to squeeze through the weir guard so I guess they live in the sump now.
The thing about dwarf chain loaches is they are just smart enough to be curious enough to get into trouble, but not smart enough to avoid trouble