I wonder if I need to change it to "The pond is deep and it looks black."
Is the original sentence fine?
Can someone help? I still haven’t got any clue yet
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The pond is deep and looks black.
The pond is deep, and it looks black.
In 1, there's a parallelism in that both is and looks are linking verbs connecting predicate adjectives to pond. You might use that structure if there were some esthetic reason to, for example, for the whole phrase to be parallel to another phrase.
But, to me, it doesn't sound nearly as good as 2, the sentence with it.
Being parallel isn't all or nothing, and it isn't always desirable.