Do fish eat kelp

Kelp does not eat, it is a plant, a producer.

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Sunlight. It's a plant, not an animal.

Kelp do not eat sunlight, and kelp is NOT a plant. Kelp makes its own food by a process called photosynthesis. Kelp is a protist from the kingdom of Protista, it is not a plant

Good grief - kelp is a seaweed, not a protist. It is one of the brown algae, and indeed uses sunlight as the energy source to make its own food.

Actually, it is a protist and it gets nutrients from photosynthesis.

Yep, kelps are seaweeds, but they are actually from the Kingdom Protista (i.e. protists). They belong to the Class Phaeophyceae which are protists, not plants (although clearly, they are plant like). And yes, they photosynthesise.