I don’t know of any complications or habitual deficiencies of Paros which were raised separately without parents natural care for a brood is not as much developed than with many cichlids. It’s rather an archaic kind of a care, restricted to the very first 10 days from laying the eggs till the darkening of the larvae, as Bernd said.
There are a few people in Germany only who managed to get a clutch develop without the caring father; one is our pioneer breeder Günther Kopic. But he describes the method as rather tricky and difficult, since you have to substitute the missing male by hand-care yourself, in picking out each individual egg that is liable to infest others with funghi. He did this for several days three or four times a day, and even this was impossible without the use of funghicides. The father’s care is the most effective one can imagine; but when the larvae get dark, it ends or is at least no longer necessary.
By the way, I have several times raised about fifty young Paros for about 8 weeks in 12-liter-tanks with their parents present. But it depends on the individual fish; often Paros are very tolerant against their small young, but – I regret to say – often they are not.