Thanks again for the quick reply. A site that described nematodes as looking like wriggling cat hairs (but, of course, shorter) had pictures.
Nematodes it is!
The tank has two Anubias nana plants which are attached to a piece of driftwood and what started as 7 Java Ferns (Microsorum pteropus) attached to two more pieces of driftwood. The Javas are multiplying so must be happy. My DH brought them back for me from Maui.
I'll add two more glowlight tetras and hope they'll be happier and soon be schooling.
I'm a newbie in the sense that the last time I kept fish was in the early 1980s (we're newly back in the USA) and the hobby has definitely changed! For the better!!! Unfortunately we live on an island with only one small pet shop with only a few tanks of fish and no fish expert employees. But the ferry is due to come in 2007 and we'll be able to visit Honolulu with our van. A couple of 50-100 gallon tanks are in my future.
My previous tanks were two 20 gallon and a 50 gallon all of which have been in storage in CA
for 23 years ... the joints have probably deteriorated.
Meanwhile I'll practice with 10 gallon tanks (I have a second to set up).
BTW, this is a great site!