YOU SAID:

once upon a time there was a squid

INTO JAPANESE

かつてはイカがあった

BACK INTO ENGLISH

Once there was a squid

INTO JAPANESE

一度イカがいたら

BACK INTO ENGLISH

I had squid once

INTO JAPANESE

私は一度イカを食べました

BACK INTO ENGLISH

I ate squid once.

INTO JAPANESE

私は一度イカを食べた。

BACK INTO ENGLISH

I ate squid once.