has anyone used formalin for treating fungus on fish eggs? recently had a pair of thorichthys malcupinnis breed for the first time but day 2 some fungus. id prefer not to use methlyn blue and have a big bottle of formalin already. all the eggs are fungused over yet, would it be worth it to try to save 50% of them? i know it may take a couple tries for them but just trying to plan ahead 
thanks!

thanks!