Do the effects of the Magic Fish and Magic Plants stack upon one another?

Another words, if I have a Magic Plant of Fertility and a Magic Fish of Fertility in the same tank, will I get 3 babies per fish? Or would this just be a waste of money?

Thanks for the assistance.
Scott

PS... I'm working on a file that allows you to do your breeding and see the resulting fish with the new fish base health and base price. I'll let you all know when it is ready.