I haven’t used hikari sturgeon, but I have used sera sturgeon.
I liked them alot personally because it seemed like the rays were able to digest it much better than most other pellets including the carnivore and massivore pellets from hikari. My rays would go nuts for them as well so it was a win imo.
One down side is that sturgeons need more fat because they are cold water species, so it could be a con. But I would imagine you could get away with young active rays as apposed to mature rays. (My speculation)
I know this isn’t the hikari that you are specifically asking about, but hikari typically makes a palatable enough pellet that it shouldn’t be too much different imo.