If you want to breed dolphins, you would want to get more than just 1 (a group of 4-5 is good). Are you certain you have a male? Are you certain your getting a female? Males of similar size will tend to fight. If the tank is too cramped, they won't breed. They need "open space" and good water parameters. Large water changes can help induce breeding.
As long as you don't have any species that would be far more aggressive than your current stock (aka most mbunas), you should be ok. BTW, tank is going to look really small in about 6 months when the growth of all the fish start to kick in.
Dolphins like to lay their eggs on flat rocks and pick them up immediately after. Lay a piece of slate for them to use.
As for the fry, if you expect to save them, you'll have to strip the female before she releases her hatch. (if you don;t strip her, the other tank mates will eat them). (Females spook easily and will spit their eggs/fry out. Being able to catch them before they spit their eggs/fry out can be tricky, it's more of an art). The fry have a SLOW rate of growth. Takes about 4-6 months for them to reach a good 2 inches. Don't expect to "rehome" this guys until they reach about 1.5 to 2 inches.
I say breed away, but be aware of what your getting into.
