No one likes tropical fish more than (she, her).

I can't really tell because usually I separate the sentence into two but the word is at the end so I can't.

ITS SHE I GOT IT WRONG

there is an implied verb at the end:

No one likes tropical fish more than [does].

So it is clearly "she" and not "her".

This brings up a common mistake. Many people say

My mom likes cookies more than me.

meaning that mom is very fond of cookies. But what they are saying is that

My mom likes cookies more than [she likes] me.

which is probably not the case. To be correct, they should say

My mom likes cookies more than I [do].

In this case, the pronoun "she" would be the correct choice. The corrected sentence would be: "No one likes tropical fish more than she does."

In this sentence, the pronoun "her" is used after the phrase "more than." To determine the correct pronoun to use, you should identify who or what is being compared. Let's break down the sentence:

"No one likes tropical fish more than (she, her)."

The subject of the sentence is "no one," and the verb is "likes." The phrase "likes tropical fish more than" introduces a comparison. The question is who likes tropical fish more than this person?

To find the correct pronoun, rephrase the sentence using a complete clause and separate the parts:

"No one likes tropical fish more than she does."

In this rephrased sentence, we have a clearer subject-verb-object structure. Here, "she does" refers to the person who likes tropical fish. Therefore, the correct pronoun to use is "she."

The complete sentence would be:

"No one likes tropical fish more than she does."