leave the eggs with the parents as long as you want, its a matter of preference. neons are just as easy to breed if not easier than orchids, the baby dottybacks will eat the same as the clowns, and please stay away from bbs unless you plan on enriching them with vitamins, they are pointless and dont need to be fed to fish. as someone put it in another post on here, i forget who, brine shrimp are like popcorn, it tastes really really good but if you tried to live off of it you wouldn't make it long. replace the bbs with live copepods or mysis. if you are using pvc for the dottybacks they will most likely lay in one of the tubes, they are cave spawners.
that is a good idea with the snowflakes, you can sell the fry for a good amount. but not all the offspring will bear the snowflake pattern, there will be plain patterned ocellaris in the mix as well