So Cathy, you have two problems.
Green water and hungry heron.

Did you end up with a lot of leaves and dead vegetation
last fall? Your pond may need a clean out.
Or you might consider a veggie filter.
Did your fish manage to reproduce themselves several
times over? Let the heron chow down and reduce the population.
(no flames re poor fishies, I just came from the dentist and I'm
looking to bite anyone's head off!!)
Anyway fertilizer might be getting in there?
Whatever happened, you've got too many nutrients from dead vegetation or fish
poo) in there
and they have to go or you need somebody (plants) to eat them up.

And now for Hungry Herons ~
- string fishing line around the pond, above, below, everywhere.
- put in an electric fido fence
- netting over the pond.
- a motion activated sprinkler(s)
- a brick flue at the bottom of the pond
to give the fish a place to hide
- Migratory Bird Act forbids lethal methods,
heavy fines and jail time take away from pond time ;-)


k30a