Step-by-step grammar check
We want the sentence to be clear and easy to read for a 6-year-old. Here are the fixes and a good version.
- Subject-verb agreement: The verb hunt matches the plural subject moray eels.
- Time phrases: We say at night and in the day or better during the day.
- Parallel ideas: Keep the two actions in the same form: hunt at night and hide during the day.
- Article and capitalization: Moray eels should be capitalized only as a proper noun at the start; otherwise moray eels is fine. If starting the sentence with the species name, capitalize correctly: Moray eels.
Corrected sentence: Moray eels hunt at night and hide during the day.
Alternative simple version: Moray eels hunt at night and sleep in coral crevices during the day.