Little White Balls on Pond Walls

Greetings.
This is my first post relating to fish and first trouble to report.
Cannot find a newsgroup specific to Koi. Could use some guidance there.

Have an 80 gallon black rigid plastic in-the-ground pond with 2 fan tailed goldfish and 2 orange and black Koi. All about 2 years old. They get along fine. No fighting and no biting. One filter/pump servicing a 'ball' fountain, another servicing a statue water fall cascade. Plenty of action.

About 3 weeks ago they showed little interest at feeding time and displayed a rare action of all 4 huddling down in the white gravel in a crevasse formed by the pond wall and solid wall of the larger filter/pump box. All four would squeeze in very tightly and be motionless for hours. No bumping or nudging. Then later on they would all eat the food rather casually.

Routine:
Secure pumps at night. Run both all day.
Morning feed: Pumps off, Wardley Pond's "TEN" floating flake food. Gone in 5 to 8 minutes (normally)
Two PM feedings, pumps on, Laguna's floating "Small Pellets". Gone within 3 to 4 minutes (normally)
TETRA POND's "AquaSafe" every 2 weeks.
Power Siphon clean gravel and 25% water change every Saturday.

Noticed water was still clear but with a green tint to it. Both tap and pond samples tested very good at PetSmart.
Observed 11 specific tests there. At their suggestion, I bought and used Aquarium Pharmaceutical's "AlgaeFix"
Then the fish began to show a purple fuzzy coating on scales and tail fins.

PetSmart retested tap & pond water samples. Still showed very good.
They sold me Aquarium Product's APPond "Anti-Fungus" which I used as directed.
Then noticed hundreds of 1/16th inch (1.5 mm) diameter little white balls on the normal thin cover of algae on pond walls.
Thought, at first, perhaps they could be fish eggs ??

Bottom line:
All fish got a purple fuzz coating and a few white "balls" and 3 have died, last Koi is swimming on it's side today free of balls but the white balls are multiplying in number, but not in size, on the pond walls..

Plan on draining pond, cleaning, sterilizing with oxygen bleach and starting over.

Any advice is welcome.

Thanks,
Jim.

Try rec.ponds for info. Your fish are starving for oxygen. Pumps
must run 24/7 even plants remove oxygen at night. White balls sound
like toad eggs. When they hatch the tadpoles will also deplete oxygen.
PURPLE fuzz is a new one on me. Hope that helps.
"James W. Delaney" <omnitech.TakeThisOut@ameritech.net> wrote in message
news:3F01FDC4.27C42B8B@ameritech.net...
Greetings.
This is my first post relating to fish and first trouble to report.
Cannot find a newsgroup specific to Koi. Could use some guidance
there.

Have an 80 gallon black rigid plastic in-the-ground pond with 2 fan
tailed goldfish and 2 orange and black Koi. All about 2 years old.
They get along fine. No fighting and no biting. One filter/pump
servicing a 'ball' fountain, another servicing a statue water fall
cascade. Plenty of action.

About 3 weeks ago they showed little interest at feeding time and
displayed a rare action of all 4 huddling down in the white gravel in
a crevasse formed by the pond wall and solid wall of the larger
filter/pump box. All four would squeeze in very tightly and be
motionless for hours. No bumping or nudging. Then later on they
would all eat the food rather casually.

Routine:
Secure pumps at night. Run both all day.
Morning feed: Pumps off, Wardley Pond's "TEN" floating flake food.
Gone in 5 to 8 minutes (normally)
Two PM feedings, pumps on, Laguna's floating "Small Pellets". Gone
within 3 to 4 minutes (normally)
TETRA POND's "AquaSafe" every 2 weeks.
Power Siphon clean gravel and 25% water change every Saturday.

Noticed water was still clear but with a green tint to it. Both tap
and pond samples tested very good at PetSmart.
Observed 11 specific tests there. At their suggestion, I bought and
used Aquarium Pharmaceutical's "AlgaeFix"
Then the fish began to show a purple fuzzy coating on scales and tail
fins.

PetSmart retested tap & pond water samples. Still showed very good.
They sold me Aquarium Product's APPond "Anti-Fungus" which I used as
directed.
Then noticed hundreds of 1/16th inch (1.5 mm) diameter little white
balls on the normal thin cover of algae on pond walls.
Thought, at first, perhaps they could be fish eggs ??

Bottom line:
All fish got a purple fuzz coating and a few white "balls" and 3 have
died, last Koi is swimming on it's side today free of balls but the
white balls are multiplying in number, but not in size, on the pond
walls..

Plan on draining pond, cleaning, sterilizing with oxygen bleach and
starting over.

Any advice is welcome.

Thanks,
Jim.