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The early use of hard-boiled egg yolk was as an infusoria substitute, and
called for it to be squeezed through cheesecloth. What the frog and discus
people have done is make a paste out it to stick to the side of the container
for a few hours, after which it must be cleaned off and the water changed.
Robert J. Goldstein, Ph.D.
Robert J. Goldstein & Associates, Inc.
8480 Garvey Drive
Raleigh, NC 27616 USA
tel (919) 872-1174
fax (919) 872-9214
e-mail rgoldstein at rjgaCarolina_com