Probably but they don't describe it very well so maybe best to spend your money on something else, unless you can go to a shop and read the back of the container.
This would also be good for when they are very small
http://www.trademe.co.nz/pets-animals/f ... 731322.htm
This stuff you've already looked at, will be ok for killie fry
http://www.trademe.co.nz/pets-animals/f ... 901478.htm
This also looks good - 3 different sizes from super weeny to weeny... I'd probably get this stuff and then see how big the biggest powder was.
http://www.trademe.co.nz/pets-animals/f ... 074778.htm