Hi if it was me i wouldnt feed algae waffers for at least month or 2 just feed them zucchini and crushed flake.
I find algae waffers not a good combinatiom for young fry
agreed, you dont know what you get in those wafers! try some "tender to the touch" boiled pumpkin its nice and soft and easy to consume for those little mouths
another tip, when doing water changes dont just pour the water in the slightest change in water metres can shock tiny tots and kill them. let it trickle in via syphon hose or some sort.
and dont forget to swish around the fry saver a good amount of times during the day to stop any nasty stuff building up