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I guess it really comes down to "where are you modeling?" Cape Cod is the geographical dividing line - warmer water south of the Cape and colder water to the north.
South of Cape Cod, where Doug lives, the water supports the greenish algae growth he demonstrates in his videos. The green stuff usually grows in the backwaters where the water is calmer and there's not a lot of wave action.
North of the Cape the water is colder. It supports reddish/brownish/green rockweed at the tide line. The rockweed has a rubbery texture and is edible. If you've ever been to a "Maine-style" clambake you'll remember it as the stuff the lobsters were steamed in. Lobsters also get packed in it when shipped across the country.
At the tide line I use a wash of black and green to darken the areas underwater at high tide and to define the tideline. Then I model the rockweed by mixing fine brown Scenic Foam with Mod Podge gloss medium. Mix it so that it has the texture of oatmeal. I push it onto the rocks and seawalls using my fingers and then "set" it in place with a wet brush. After it dries I paint on more Mod Podge to give it a wet, shiny look. Sometimes it gets a very light sprinkling of fine green foam.