Ditto. The best thing for you to do is just be patient and wait. Performing regular water changes, feeding quality food, keeping up with the tank parameters will be your best actions. I don't know how small or young a Cuban pair will breed but if they have bred for Dan in the past, keep them and wait and see. As mentioned in your other thread, their bond may have been broken because of the shipping and new environment. Separating the male and giving him time to gain size could be a cheaper and better option for you. With breeding fish, keepers can be their own worst enemy. Constantly rearranging the tank, adding and removing things, and basically continually disturbing the daily habits of a newly introduced pair can really cause more harm than any of the pair's aggression. I have had a few pairs breed days and weeks after being introduced and others that has taken months or longer. Unless you're dealing with Convicts, you usually have to wait things out before you see any breeding. Honestly, it hasn't been that long since you got them. But what ever you decide good luck and be a little more patient.No way to tell 100% at that size or by those pictures.
Dan sent you a pair. Be patient and they will spawn for you eventually. They are still young and in a new environment...and chances are, NOTHING you buy tomorrow will spawn any faster than what you already have.
Did you read somewhere or did someone tell you that getting cichlids to spawn was quick and easy? Because its not.
Id be willing to bet you could alter your water changes/ feeding/ temps/ tank mates/ environment and have more success than buying another fish.