Detailed Instructions: In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Q: Sentence1: Ida decided she wanted a saltwater fish tank. Sentence2: She thought saltwater fish were so beautiful! Sentence3: Then she did some research about setting up a tank. Sentence4: The process was expensive and very, very difficult! Sentence5: Ida decided a saltwater tank wasn't worth the effort, after all.
A:
Saltwater fish, Ida