"John Allen" wrote in
:

What is the best way of ridding a tank of planaria.

Planaria themselves are harmless. They are a kind of flatworm. They won't
directly hurt your baby angelfish, but they are a sign of a dirty tank
bottom. Your angelfish will eventually transfer their sticky fry off of
the leaf and place them in the substrate where they will soon become free-
swimmers. If your substrate is truly filthy, the fry will not fair well
there.

Observe how much food is floating to the bottom of your tank, and
reconsider how much you are feeding your fish. Good gravel vacuuming with
a typical aquarium siphon will remove much of the food source for these
worms and they will naturally dye back as a result. You will have to do
this while the angelfish eggs are still on the leaf or you will end up
sucking up your angelfish babies as well.

Try not to spook the parents while cleaning your tank or they may feel
inclined to eat their eggs to recycle the protein.

Blue three spot or opaline grouramis will eat planaria, but they may also
irritate a breeding pair of angels.

Using catfish to clean the bottom of this tank is not a good idea, as they
will most likely ignore the planaria, but will happily eat your angelfish
babies.