I think it would be easier to move the Frontosa. The Calvus is tiny and shy, the Brichardi appears to be guarding the babies. They couldn't be half Brichardi could they

?
I would move the Frontosa to a tank with some Rainbow dithers and Syndotis. Also, a Blue Acara, and not sure how that would work out. It's the only other tank I have where I could raise the PH and have a chance of it working. The Acara and Front are about the same size.
Hi Faythee.
They could quite possibly be bichardi crosses, i know because i happened 4 times in my tank! Ive got a breeding pair of Julidochromis ornatus and when they bred the first time i thought my big male birchardi was just helpin out, but as they had 3 more batches and the first got bigger i started to notice that 10% of them looked different. They were! 10% of them were true ornatus, the rest ornatus/birchadi. They are now about 1 to 2 inches and are on sale where i work! lol
I just left the fry in with the 3 parents and they were fine. Birchardis are VERY good gaurdians. And it got the rest of my fish used to having smaller fish around that they're not aloud to eat, great if you want to add any in the future.