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Thanks, Aaron! You're right. The Carolina Horsenettle's description certainly seems to accurately portray the plant I had seen!

Excellent suggestion! It seems far more likely based on the description. Thanks!

Thank you both! I wish I could've caught video of this guy. The fish had moved like seaweed in a mild current and took me a few moments to recognize that it was not a plant.

Thanks! This one was quite a delightful discovery.