Hi Joan - 8 GF in a 1800 gal pond shouldn't need much to clear the water - a
bio-filter and oxygenation will do it (waterfall for O2) - I have ~ 40 fish
(incl 2 large koi in a 1100 gal pond and it is clear with no UV) - is this a
new pond? - it takes awhile to stabilize and a bacteria supplement helps to
speed things up
Gale :~)

The pond is about 1800 gallons, only around 8 goldfish. Water
parameters are all good. Just have tons of suspended solids: mud and
now a major algae bloom, despite barley straw and elodea. Can't see
the fish unless they are right up close to the top.

Joan