Pond goldfish always hiding -- Please Help
 

Hi,
I'm a new pond owner.
About 2 weeks ago I bought 6 goldfishes and the first day they seemed
to be fine, but after that they always been in hiding. 3 days ago I
bought 5 more goldfishes and pretty much the same thing happened, at
first they were very active but the next day they went to hiding with
the "old" guys.

It's a 160 Gallon pond with a lot's of rocks. I'm using underwater
pump and filter kit, which includes Biofilter. I tested the water at
the local Petco and it seemed to be fine.

Any ideas why fish will be hiding all the time?

Thanks in advance

Googlefan