Hi all,

Approx. 750 gallon (US) pond with plain old pet store goldfish that have
been in the pond around four years, at least the original generation, and a
waterfall about 1-1/2 feet high that drops into the back of the pond.
I have noticed lately that the goldfish will "queue up" like buses in a
station righ under the waterfall. This only seems to happen in the early
evening, when the direct sun is gone - during the day, they're usually
hiding under the lillies.
They don't seem unhappy, and they frolic, play, spawn, and eat - but they
seem to like to do this "parking" thing. Any idea what this is?

Sean