That 50 gal is a very small tank, but if they are well bonded it might work.
I had my pair in a 125 with a 100gal sump, without problems and during pre spawning removed all other fish. Some fry ended up in the sump, and this turned out be a good thing.
Because fry can be canabalistic if in close quarters
Lots of small feedings per day will keep the largest fry from eating the smaller ones.
Also having lots of algae to graze really helps.