With fish like discus and angels, albino fry are pretty much noticeable right away. They tend to be weaker and nearly blind at birth, so they tend to huddle near the bottom or swim around aimlessly. To get them to eat you basically have to drown them in brine shrimp because they seem to have a hard time seeing and hunting them down.
In fish that have both albino and normal fry, the groups look different very early on. You should be seeing differences already. Is it possible maybe they’re not albino but leucistic instead?