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[quote="Greg Barney"]At my office building I have an outdoor decorative fountain.  It is 
concrete, painted with blue swimming pool paint.  Approximately 7 1/2 
ft in diameter, 18 inches deep, curving hemispheric sides.  Statuary 
rises in the center and a 300 gph pump elevates water about 4 ft to a 
figurine pouring water from an urn.  The water flows down into two 
shells and then is returned internally to the pool (no splashing). 
There is an overflow drain at 18 inches, and an automatic refill pump 
to maintain water level.

Dark green algae grows on the side of the pool.    After a while the 
water turns green and gets dirty.  In the past I have dumped in bleach 
weekly and then swept, drained and refilled the pool monthly to 
maintain a pleasing appearance with clear water.  This process does 
not eliminate the dark green algae, but seemed to keep it under 
control.

I've had an indoor aquarium for about a year with modest success, so I 
thought perhaps I could add some fish to the outdoor pond/fountain to 
control the algae and add interest.

After draining, cleaning and refilling the pool I added a dozen feeder 
goldfish.  3 survived.  I added another 20 after a week, and had 6 
left.  I'm told that survival rate is not unexpected with feeders. 
So, I added 3 larger (3-4 inches) goldfish.  I have been feeding them 
once a day about a teaspoon of floating pellets until they are 
acclimated.  The larger goldfish seem to be quite active and healthy; 
the feeders are dying off.

I have also added 4 small (1-2 inch dia) floating plants that look 
like lily pads but are not.

The dark green algae is growing more dense.  Worse, the pool water now 
appears a lighter green, is murky so you can hardly see the fish when 
at the bottom.  The water coming out of the figurine urn appears 
clear, but the shells are beginning to look greenish.  Still, the fish 
appear active and healthy.

The pH is 7.6.  I tested for ammonia and the test indicated no 
meaningful amount.  A pet store tested for nitrites and said that 
looked ok.  I have tried adding an algicide without noticeable effect. 
I tried adding an indoor aquarium Clear Water solution, with no 
effect.

I have an indoor algae-eater that has grown a bit large for the 20 
gallon tank--should I put it in the fountain pool?  Add more goldfish?

I want to maintain a healthy habitat for the fish, and still have an 
attractive fountain pool.  One store suggested a pond filter, but that 
listed at $100 and seems a bit much for this size pool.

Thanks for your comments!

Greg[/quote]

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