well your eggs shouldnt get funguss
Del im led to believe meth blue works by stoping light and this in turn stops the fungus form growing! from what i understand it is one of the older procedures that still works today. it should improve the hatch rate and if the parents dont object to the dark blue then not a problem.
good luck and have a look at BIDKA for ideas on what to do and what not to do!
http://forum.bidka.org/index.php
keep us updated on how they get on !
rob.