I am 90% sure it is the Niad or brushy pondweed. And That lasy thought about physically removing what you can and then hoping the carp will handle the rest is the only solution I can think of. And the four foot depth seems about right also. Nasty stuff at these levels. I am hoping the fish will be unaffected by it. Let me know if it can be detrimental to the fish and I will get more aggressive on the attack mode.
