"Benign Vanilla" wrote in message
...

"george" wrote in message
news:enumd.94943$HA.39480@attbi_s01...
snip
I've not seen it happen in hours in my goldfish or Koi, but my yellow
tang
in my
sal****er tank will become almost completely white after the lights go
off.
Next day, when the lights come back on, he turns yellow again. Most
likely a
defensive adaptation. I've always believed that goldfish being black at
birth
and for a time afterward is a defensive adaptation. Many animals have
this kind
of adaptation.

I have black goldie babes go gold, but I have never seen a fish change
color
in hours. I swear I am not imagining this. Anyway he/she/it is swimming
around in the 55 gallon tank and the other fish seem to like he/she/it.

The dern thing was black again last night. I swear I have not been planting
any plants either.

BV.