I know someone who's kept them in ponds with salt, but I don't know how tolerant of salt they are. Also, depending on the fish you have, chinese algae eaters can become a threat to other fish when they get bigger. They can also do damage to plants. So, if you have large aggresive fish, then the chinese algae eater may do. If not though, there aren't any other algae eaters for brackish that I know of. Possibly american flag fish. I've heard of them doing good with pond over growth.