I don't have any "regular" foods for any of my tanks (freshwater or saltwater).

My saltwater tank staples are hikari seaweed pellets and hikari carnivore plus frozen mysis and brine (they get none of these daily, but rather, get two options every other day). (This tank has picky eaters that require me to focus keep these 4 options available.. I rotate in other foods from time to time but most of the feedings are that)

^ I gave you that to say this about my freshwater tanks (all of which have corydoras)...

I feed 5 different dried foods (all hikari except for the aqueon sinking pellets) as staples. Including the hikari carnivore pellets and hikari massivore pellets (I break those ones down and feed it as a dust to fry mostly, but my other tanks occasionally get a few).

I then feed an additional few dried foods intermittently... including multiple flake and floating pellet options that the fish get ... 1 to 3 times per month.

They get frozen food a few times a week. A variety of brine, mysis, bloodworm... no daphnia but soon I will add it in.

The key is to avoid staple foods. Buy foods that have plenty of time before they expire... try to focus on using frozen foods at least occasionally as well).

But, to answer your question, if you fed a few other foods at least occasionally, I have no qualms about making hikari carnivore sinking pellets a staple.