YOU SAID:

Fish in fishbowls probably don't even know that the space outside the fishbowl isn't filled with water.

INTO JAPANESE

おそらく fishbowls の魚、金魚鉢の外のスペースが水で満たされていないこととはわからない。

BACK INTO ENGLISH

Probably,

INTO JAPANESE

おそらく、

BACK INTO ENGLISH

Probably,