Eggs in my tank?

Please excuse my ignorance, but I've got a question. I have a 46
gallon freshwater tank populated with a few Zebra Danios, Black Skirt
Mollies, some Albino Catfish, two Glass Catfish, a trio of non-
descript Catfish, and a giant Pleco (a fine looking fish, indeed!).
These have all been together for at least six months, a few as long
as six years (the pleco among the old timers). I recently noticed a
couple hundred or so white eggs, each about the size of the head of a
pin, attached to the glass, primarily, though not exclusively, in the
upper corners of the tank. Any idea which of these critters might be
responsible? Are they waiting to be fertilized or can I expect to
soon be overrun with one of the above mentioned fish? Is there
anything I should do to ensure their safety and/or viability? I
think it'd be fun to see hundreds of tasty morsels swimming around,
with perhaps a dozen or so growing to adulthood. Any thoughts and/or
suggestions would be appreciated.