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Nematodes are so common in nature, that if the basic matter of the world 
disappeared and only left the remains of the nematodes, the soil outline and 
the outline of most of the plants and animals could still be seen.  We are 
therefore lucky that most are harmless.  Nevertheless,  the wise individual 
will sterilize any soils they put into the aquarium as a precaution against 
the rare occurrence of nematode problems or other pests from the teeming 
soils.  Most soils that are "rich" in humus are teeming with various 
microorganisms, small flora and fauna of other kinds, including algae and 
usually BGA of course too. It is also my humble opinion that you will  on 
most occasions of fish introduction from external sources introduce new 
nematodes into your aquarium environment.  This would be true of plants too 
and in most cases these are also harmless.

If you have ever seen a fish with serious nematode infection, you will not 
take undue chances in the future however.  This provides good reason to 
quarantine both fish and plants before introducing them into an expensive 
long-standing and stable aquarium.  I boil or bake any soil which I use.

Elmer Morehouse