Hey beast, if you're gonna divide the parents in the 55 gallon like mention above, you would have to artificially raise the frys therefore yes you would have to seperate them....now if they;re wiggling like mygiants said... Id keep them with the parents... thats a for sure fry raiser less work for you, and guaranty success!... dont mix up the frys until they;re able to fend for themselves.... at the free swimming stage, their yummy treats for your other angels, even at peasize their still yummy treats,... Id keep all the same size angelfish together, itll make your water changes a lot easier.....also, at such a young age, its usually hard to determine sex....Id say I have even had times where I thought one angelfish was a female and turns out to be a male... now also a tip I would like to suggest... instead of buying small frys to grow out...geez this will take you almost a year...... youre probably better off buying a proven pair that raises its own frys to use for practice.. it will cost you more at one time, but less over the 8 months period of you raising your frys to adulthood...just my 2 cent...