Cam it's a great idea.
However..
Just to let you see the code the other replies use:-
They are being extremely polite!!!
A 60lt tank is at least 30lt to small to try this experiment in.
You may loose a valuable fish from your successful pair,
DO YOU REALLY WANT TO RISK THAT!
I know your young and wanting to try different things and that's great, really great - I do mean that.
But there are some rules that need to be meet when breeding different species, as long as new ideas still meet the rules they should work.
Pairs of South American Dwarf Cichlids DEMAND a minimum territory form other Pairs of South American Dwarf Cichlids, 30mmsq is fool hardy!
Even keeping a trio (1m & 2 females) in a 90lt tank is hard with out removing line of sight from 1 female to the other, and if both should breed at the same time the male may have no where to go.
But I could be wrong and I'm very happy for you to prove that.
As it would be valuable new information to add to the knowledge if it works.
I wish you no bad luck!
Stu