One of the common names for Southern Naiad is "Bushy Pondweed" - but is sometimes repeated as "Brushy Pondweed". This plant is technically called Najas guadalupensis, and is a very common pond inhabitant.
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Grass carp are one effective means of managing it. However, I wouldn't recommended using grass carp as a sole means of bringing a SEVERE problem under control since it would take a high stocking rate that could eventually denude the pond of all edible forms of vegetation.
Instead, reducing the plant's population with manual removal methods or herbicides and then stocking with a moderate level of grass carp to maintain desired levels of plant-life, may be a more preferably alternative.
