Grandpa John wrote

Underwater, please expand.

Do you have a good nursery that carries pond plants? Many of them sell plants
that grow completely underwater. Some of them are getting hard to find now as
they can become noxious weeds in many states. Anacharis and hornwort are common
underwater plants.

Substrate algae is more like a green fuzz that grows on the side of the pond,
the sides of plant pots. It should not fall apart when you touch it.
Stuff that falls apart is probably dead algae that should be removed from your
pond via a mechanical filter - what this could be is anything that catches
stuff before it goes into your pump or before the water goes over the
waterfall.



kathy :-)
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