Yea, also I agree I soaked the flake in with garlic and tank water and added it using a pipetteThats definitely good it didnt went south overnight!
I'd just watch them and maybe read up on diseases in general and create a plan what you gonna do if it goes south.
Careful with feeding not to foul the water - you can feed them with a tweezer instead of just throwing stuff in the water - that way if they dont eat it you can just take it out. Long fish tank tweezers are also very useful to remove uneaten food flying around in water.