In the Hidabrot this week they had the following statement:
This means Fish food since it is disgusting for humans to eat it does not need to be Kosher for Pesach…
I did a search on Otzer Hachochma to see what the source is for this and if this is a universally accepted opinion, I found According to (Reb Avraham, the son of Reb Shlomo Zalman Aurbach) says in פתחי אברהם 218 that even if there is an automatic feeder and the fish food is sold to a goy, you are getting Hanaah from chometz on Pesach. Rabbi Shammi Gross rules in a similar fashion.
I find it understandable why it would be assur on Pesach to have Hanaah. Can anyone explain please the understanding of the Hidabrot and why it would be allowed? There is still a problem of Hanaah from Chometz on Pesach!
Although this is related but not the same question: What can I feed my fish over Pesach?