I introduced a clown loach to my tank a few weeks ago and my lone serpae tetra
immediately started to pester him. It would follow him all over the tank and
nudge him although the loach never seemed to even notice. There was never any
fin nipping but just annoying nudging and it's still going on.

Now I've figured out what is happening. The loach actually follows the tetra
all around the tank while the tetra nudges the loach occasionally, especially
while the loach is trying to search for food. It's as if they've become best
buddies. It's hard to find the serpae without the clown nearby unless the
latter is resting on the back of the tank.

It's quite a show.

Glenn